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6 Best Internet Providers in Diamond Bar, CA

Find internet availability by address in Diamond Bar, CA

Jump to: Best Internet Provider | Availability Maps | Customer Reviews | Diamond Bar ISP Report Card | Business Internet in Diamond Bar

Diamond Bar ISP Report at a Glance
ISP grade Diamond Bar ISP Report Card B-
Average speed Download Speed for Most Households 4,110 Mbps
ISP count Number of Internet Service Providers 6
Customer review count Real Diamond Bar Customer Ratings 4

This page reflects the most recent FCC update from January 06, 2026, based on the Broadband Data Collection as of June 30, 2025.

Data update information

This page reflects the most recent FCC update from January 06, 2026, based on the Broadband Data Collection as of June 30, 2025.

Diamond Bar has 6 internet service providers, they are sorted by coverage, available speed, and customer rating from our unbiased internet provider report. Fiber, Cable, Fixed Wireless, and DSL internet are available in the city. Reviews are grouped by provider and the type of service they offer, covering all 4 available internet technologies in Diamond Bar.

Diamond Bar overview

Diamond Bar has 6 internet service providers, they are sorted by coverage, available speed, and customer rating from our unbiased internet provider report. Fiber, Cable, Fixed Wireless, and DSL internet are available in the city. Reviews are grouped by provider and the type of service they offer, covering all 4 available internet technologies in Diamond Bar.

Compare Providers Ranked by Coverage, Speed, and Customer Ratings

Spectrum

Spectrum logo

Availability:

99.9%

Customer Rating:

3.3 of 5 stars

(1,936)

View Plans

1-877-411-1381 Price: $30.00 - $120.00 / mo.

Connection

Availability

Avg. Download Speed InfoThe highest download speed available in Diamond Bar.

Max Download Speed InfoCalculated from the maximum speeds available to most Diamond Bar residents, weighted by user distribution.

Customer Rating

Cable

99.9%

1,000 Mbps

1,000 Mbps

Cable: 3.2 of 5 stars

(1,618)

Frontier

Frontier logo

Availability:

73.3%

Customer Rating:

3.4 of 5 stars

(166)

View Plans

1-877-361-2072 Price: $44.99 - $134.99 / mo.

Connection

Availability

Avg. Download Speed InfoThe highest download speed available in Diamond Bar.

Max Download Speed InfoCalculated from the maximum speeds available to most Diamond Bar residents, weighted by user distribution.

Customer Rating

Fiber

51.8%

7,000 Mbps

7,000 Mbps

Fiber: 3.8 of 5 stars

(110)

DSL

27.2%

11 Mbps

70 Mbps

DSL: 2.5 of 5 stars

(46)

EarthLink

EarthLink logo

Availability:

94.3%

Customer Rating:

3.8 of 5 stars

(13)

View Plans

1-877-418-2092 Price: Starting at $54.95 / mo.

Connection

Availability

Avg. Download Speed InfoThe highest download speed available in Diamond Bar.

Max Download Speed InfoCalculated from the maximum speeds available to most Diamond Bar residents, weighted by user distribution.

Customer Rating

Fixed Wireless

94.3%

43 Mbps

100 Mbps

Wireless: 0.0 of 5 stars

(0)

T-Mobile Home Internet

T-Mobile Home Internet logo

Availability:

97.1%

Customer Rating:

4.0 of 5 stars

(341)

View Plans

1-833-601-2935 Price: $55.00 - $105.00 / mo.

Connection

Availability

Avg. Download Speed InfoThe highest download speed available in Diamond Bar.

Max Download Speed InfoCalculated from the maximum speeds available to most Diamond Bar residents, weighted by user distribution.

Customer Rating

Fixed Wireless

97.1%

90 Mbps

100 Mbps

Wireless: 3.9 of 5 stars

(204)

Above are the top 4 providers in Diamond Bar, CA for most people based on high speed internet coverage, speeds, and customer reviews. Click below to see all providers in your city.


AT&T

AT&T logo

Availability:

94.3%

Customer Rating:

3.7 of 5 stars

(1,051)

View Plans

1-877-610-1219 Price: $65.00 - $90.00 / mo.

Connection

Availability

Avg. Download Speed InfoThe highest download speed available in Diamond Bar.

Max Download Speed InfoCalculated from the maximum speeds available to most Diamond Bar residents, weighted by user distribution.

Customer Rating

Fixed Wireless

94.3%

43 Mbps

100 Mbps

Wireless: 3.6 of 5 stars

(164)

Verizon

Verizon logo

Availability:

62.7%

Customer Rating:

3.8 of 5 stars

(811)

View Plans

1-833-213-7018 Price: $49.99 - $89.99 / mo.

Connection

Availability

Avg. Download Speed InfoThe highest download speed available in Diamond Bar.

Max Download Speed InfoCalculated from the maximum speeds available to most Diamond Bar residents, weighted by user distribution.

Customer Rating

Fixed Wireless

62.7%

300 Mbps

300 Mbps

Wireless: 3.7 of 5 stars

(170)

Providers with less than 1% coverage in this city are excluded from the list. To see if one of these providers is available at your home, please use the address search above.

Satellite providers, which generally offer 100% coverage across the United States, are available for Diamond Bar residents as well. Some of the top satellite options include Dish Network, DirecTV, HughesNet, Viasat, and Starlink. These providers offer varied services and pricing, giving residents flexibility in choosing the best option for their location and needs.

Dish

Dish logo

Availability:

100%

Customer Rating:

3.6923 of 5 stars

(13)

View Plans

1-866-252-1910 Price: {{isp_price_range}}


DirecTV

DirecTV logo

Availability:

100%

Customer Rating:

4.3333 of 5 stars

(9)

View Plans

1-844-294-9501 Price: {{isp_price_range}}


Viasat

Viasat logo

Availability:

100%

Customer Rating:

1.7273 of 5 stars

(11)

View Plans

1-833-875-1370 Price: {{isp_price_range}}


HughesNet

HughesNet logo

Availability:

100%

Customer Rating:

2.4286 of 5 stars

(21)

View Plans

1-833-684-9249 Price: {{isp_price_range}}


Starlink

Starlink logo

Availability:

100%

Customer Rating:

3.9836 of 5 stars

(61)

View Plans

Price: {{isp_price_range}}

Speed and technology may vary by address for all providers. Please note we may have a financial relationship with some of the providers above, which does not impact the customer ratings displayed. Customer ratings listed above are national ratings, local Diamond Bar ratings may vary and are shown below.

Who is the Best Internet Provider in Diamond Bar, CA?

Verizon is the best internet provider in Diamond Bar based on California customer satisfaction ratings and reviews. Based on our extensive and unbiased survey, Verizon had the best reviews at the local, state, and national levels versus all available providers in Diamond Bar, making it a solid recommendation among providers with reviews. Verizon is an option for 62.67% of the city.

Verizon logo

Click here to get Verizon

or call 1-833-213-7018

The chart and table below show average customer ratings from customers in Diamond Bar, California, and customers throughout the country.

Top Rated Internet Providers in Diamond Bar


Verizon5.003.713.82
Spectrum4.003.253.28
T-Mobile Home InternetN/A4.004.04
FrontierN/A3.793.39
  • City Rating
  • State Rating
  • National Rating

Local, State, and National Ratings for all Diamond Bar Internet Providers

ISP / Tech TypeDiamond Bar OverallCalifornia OverallNational OverallFor Service
Verizon (1) (24) (723)View Plans
Spectrum (3) (203) (1738)View Plans
T-Mobile Home Internet (0) (22) (284)View Plans
Frontier (0) (42) (143)View Plans
AT&T (0) (107) (924)View Plans
HughesNet (0) (1) (18)View Plans
Viasat (0) (1) (11)View Plans
EarthLink (0) (2) (12)View Plans

Based on 402 reviews from California internet customers, Verizon is the best internet service provider for Diamond Bar residents. Verizon was rated at an average of 3.71 out of 5 in our report for overall customer satisfaction. Spectrum wins for second-place in California, with 4.00 out of 5 stars and 99.9% coverage in Diamond Bar.

At a national level, based on 3853 national reviews for any of the providers listed above, T-Mobile Home Internet is rated higher than any other provider, with a rating of 4.04 out of 5.

Which Providers are Available at my Home in Diamond Bar?

The map shows speeds per provider and where each provider is available. Click the drop-down menu to choose
a different provider.

Diamond Bar, CA map of internet availability

Internet Availability Key

0%
10%
50%
100%

 

Speeds and coverage vary within the city, and sometimes even from block to block. The map shows speeds per provider and where each provider is available.

Who is the Fastest Internet Provider in Diamond Bar?

According to unbiased feedback from real internet customers in the city, they reported being happiest with speeds provided by Verizon. On the other hand, based on data provided by the internet providers to the FCC, Frontier Communications should have faster speeds at a local level. While we typically put more weight on real-world customer ratings, we display both satisfaction and technical maximum information for customers to decide for themselves.

Data Reported to FCC by ISPs: Average Maximum Available in Diamond Bar

Max Advertised Speed in Diamond Bar, CA


ISP / Tech TypeMax Advertised Speed
Frontier Communications7,000 Mbps
Spectrum1,000 Mbps
Verizon300 Mbps
EarthLink100 Mbps
AT&T100 Mbps
T-Mobile Home Internet100 Mbps
Viasat100 Mbps
HughesNet25 Mbps

Customer Ratings for Internet Provider Speeds in Diamond Bar


Verizon5.003.834.00
Spectrum3.673.523.61
FrontierN/A4.023.55
T-Mobile Home InternetN/A3.823.96
  • City Rating
  • State Rating
  • National Rating

ISP / Tech TypeDiamond Bar SpeedCalifornia SpeedNational SpeedFor Service
Verizon (1) (24) (723)View Plans
Spectrum (3) (203) (1738)View Plans
Frontier (0) (42) (143)View Plans
T-Mobile Home Internet (0) (22) (284)View Plans
AT&T (0) (107) (924)View Plans
HughesNet (0) (1) (18)View Plans
Viasat (0) (1) (11)View Plans
EarthLink (0) (2) (12)View Plans

Based on data reported by Diamond Bar ISPs to the FCC, the fastest speeds in the city are available through Frontier Communications. The company offers speeds up to 7,000 Mbps in Diamond Bar. Therefore, the average customer can get up to 4,954 Mbps if they're willing to purchase the fastest subscription tier available at their homes.

Additionally, actual customers in the city rated their satisfaction with internet speed highest with Verizon. This indicates Verizon reliably delivers speeds expected by the customer based on the plan they are paying for.

Who is the Cheapest Internet Provider in Diamond Bar?

California customers rate Verizon as the cheapest internet service provider in state. Data comes from customers in the state rating their satisfaction with pricing. This feedback is valuable because it considers price changes and whether the speeds paid for are worth it.

Verizon received a local rating of 5.00 out of 5, which is higher than the average across all internet providers in the country. Spectrum is rated in second place for affordability by the company’s Diamond Bar customers with an average price rating of 3.67 out of 5.

The chart and graph below show how customers in Diamond Bar, California, and the United States rated the affordability of their internet service.

Rated Affordability in Diamond Bar


Verizon5.003.753.50
Spectrum3.672.892.91
T-Mobile Home InternetN/A4.184.11
FrontierN/A3.553.37
  • City Rating
  • State Rating
  • National Rating

ISP / Tech TypeDiamond Bar AffordabilityCalifornia AffordabilityNational AffordabilityFor Service
Verizon (1) (24) (723)View Plans
Spectrum (3) (203) (1738)View Plans
T-Mobile Home Internet (0) (22) (284)View Plans
Frontier (0) (42) (143)View Plans
AT&T (0) (107) (924)View Plans
HughesNet (0) (1) (18)View Plans
Viasat (0) (1) (11)View Plans
EarthLink (0) (2) (12)View Plans

Diamond Bar Internet Health Assessment

ISP Reports evaluates the technological infrastructure across the United States. This includes assessing a grade for ISP providers and infrastructure in the city and setting an index number for the digital connectivity of its residents. You can view the ISP Report Card and the Digital Connectivity Index for Diamond Bar below, including the metrics used and how Diamond Bar compares to the rest of California and nation.

Diamond Bar ISP Report Card: B-
Metric

(hover for details)
Diamond Bar California USA
51.81% 56.12% 67.25%
4,110 Mbps 3,631 Mbps 3,293 Mbps
5.3 7.4 6.8

 

Diamond Bar Digital Connectivity Index: 84 / 100
Metric

(hover for details)
Diamond Bar California USA
3.0 3.0 2.7
17% 15% 14%
99% 96% 95%
95% 93% 90%
79% 78% 75%
79% 79% 76%

Our demographic data is sourced from the latest 5-year release of the American Community Survey by the US Census Bureau.

Diamond Bar ISP Report Card & Digital Connectivity Index

The ISP Report Card in Diamond Bar is B-, which is better than other cities. The local demand for broadband internet connectivity in Diamond Bar is high with a score of 84 / 100 in our Digital Connectivity Index. This means that internet service providers operating in Diamond Bar have done a great job meeting the needs of its residents.

The Diamond Bar ISP Report Card evaluates the city on availability and speed metrics compared to other cities in the United States. ISP Infrastructure can vary greatly and on its own isn’t a perfect measure of what a city needs. Please see our ISP Report Card along with the Digital Connectivity Index above to evaluate how well the connectivity demand is met by the existing infrastructure.

95% of Diamond Bar households have an internet connection despite having 99.94% availability. 79% of households have fiber, cable, or DSL, 14% have satellite, 0% are still on dial-up, and 2% of households have internet but don’t pay for a subscription because it’s subsidized by the Affordable Connectivity Program.

As you can see in the table above, while 79% of households have a broadband connection such as fiber, cable or DSL available to their home, 79% subscribe to it. A large amount of Diamond Bar residents are taking advantage of the available internet infrastructure.

For more details, please visit our ISP Report Card and Digital Connectivity Index pages.

How do Neighboring Cities Compare to Diamond Bar?

Walnut, CA

  • ISP Report Card: B
  • Digital Connectivity Index: 86 / 100
Rowland Heights, CA

  • ISP Report Card: B
  • Digital Connectivity Index: 80 / 100
South San Jose Hills, CA

  • ISP Report Card: B
  • Digital Connectivity Index: 73 / 100
Pomona, CA

  • ISP Report Card: B+
  • Digital Connectivity Index: 71 / 100
Chino Hills, CA

  • ISP Report Card: B
  • Digital Connectivity Index: 92 / 100
Industry, CA

  • ISP Report Card: C+
  • Digital Connectivity Index: 72 / 100
Brea, CA

  • ISP Report Card: B
  • Digital Connectivity Index: 85 / 100
West Covina, CA

  • ISP Report Card: B
  • Digital Connectivity Index: 81 / 100
San Dimas, CA

  • ISP Report Card: B
  • Digital Connectivity Index: 71 / 100

How Much Speed does a Diamond Bar Household Need?

Higher speed is typically preferred, but that comes at a higher price. The average size of a household in Diamond Bar is 3.0, which is smaller than the California average of 3.0 and larger than the national average of 2.7. Diamond Bar's average household income is $111,985 which is higher than the California average of $108,618 and much higher than the national average of $90,606. Homes with more people living in them and with higher incomes tend to indicate more devices being used more often.

Diamond Bar also has 18% of its population enrolled in school between the 6th grade and college level, this is higher than the California average of 17%. Additionally, 17% of residents work from home, which is higher than the 15% of residents in California who work from home. This and other factors you can see above show us that the community of Diamond Bar has a very high need for internet connectivity and speeds.

Compared to the rest of the country, Diamond Bar households are much more technology-engaged. 99% of households have some sort of computing device, 94% have desktops or laptops in the home, and 96% have smartphones. To see what speeds you are currently getting, please visit our internet speed test tool.

Which Fiber Internet Providers are Available in Diamond Bar?

Frontier Fiber in Diamond Bar, CA

Frontier logo

Availability:

51.8%

Customer Rating:

3.8 of 5 stars

(110)

Avg. Download Speed

7,000 Mbps

Frontier Communications offers Fiber service to 51.8% of Diamond Bar homes. Across the city, Frontier Fiber has speeds up to 7,000 Mbps, with speeds from 7,000 Mpbs up to 7,000 Mbps depending on the address. Upload speeds are symmetrical, meaning they are exactly the same as download speeds for Frontier Fiber. Frontier Fiber is rated higher than other types of internet service available in Diamond Bar from Frontier in terms of customer satisfaction.

Which Cable Internet Providers are Available in Diamond Bar?

Spectrum Cable in Diamond Bar, CA

Spectrum logo

Availability:

99.9%

Customer Rating:

3.2 of 5 stars

(1,618)

Avg. Download Speed

1,000 Mbps

Spectrum offers Cable service to 99.9% of Diamond Bar homes. Across the city, Spectrum Cable is the only type of service available from the company, with speeds up to 1,000 Mbps, with speeds from 1,000 Mpbs up to 1,000 Mbps depending on the address. Upload speeds differ from download speeds, and are as low 35 and as high as 35, with an average of 35 Mbps throughout the city. Spectrum Cable is rated lower than other types of internet service available in Diamond Bar from Spectrum in terms of customer satisfaction.

Which DSL Internet Providers are Available in Diamond Bar?

Frontier DSL in Diamond Bar, CA

Frontier logo

Availability:

27.2%

Customer Rating:

2.5 of 5 stars

(46)

Avg. Download Speed

11 Mbps

Frontier Communications offers DSL service to 27.2% of Diamond Bar homes. Across the city, Frontier DSL has speeds up to 11 Mbps, with speeds from 10 Mpbs up to 70 Mbps depending on the address. Upload speeds differ from download speeds, and are as low 1.0 and as high as 3.0, with an average of 1.0 Mbps throughout the city. Frontier DSL is rated lower than other types of internet service available in Diamond Bar from Frontier in terms of customer satisfaction.

Which Fixed Wireless and LTE Internet Providers are Available in Diamond Bar?

T-Mobile Home Internet Fixed Wireless in Diamond Bar, CA

T-Mobile Home Internet logo

Availability:

97.1%

Customer Rating:

 of 5 stars

(0)

Avg. Download Speed

90 Mbps

T-Mobile Home Internet offers Fixed Wireless service to 97.1% of Diamond Bar homes. Across the city, T-Mobile Home Internet Fixed Wireless is the only type of service available from the company, with speeds up to 90 Mbps, with speeds from 25 Mpbs up to 100 Mbps depending on the address. Upload speeds differ from download speeds, and are as low 3.0 and as high as 20, with an average of 18 Mbps throughout the city. T-Mobile Home Internet Fixed Wireless is rated other types of internet service available in Diamond Bar from T-Mobile Home Internet in terms of customer satisfaction.

EarthLink Fixed Wireless in Diamond Bar, CA

EarthLink logo

Availability:

94.3%

Customer Rating:

 of 5 stars

(0)

Avg. Download Speed

43 Mbps

EarthLink offers Fixed Wireless service to 94.3% of Diamond Bar homes. Across the city, EarthLink Fixed Wireless is the only type of service available from the company, with speeds up to 43 Mbps, with speeds from 25 Mpbs up to 100 Mbps depending on the address. Upload speeds differ from download speeds, and are as low 3.0 and as high as 20, with an average of 7.2 Mbps throughout the city. EarthLink Fixed Wireless is rated other types of internet service available in Diamond Bar from EarthLink in terms of customer satisfaction.

AT&T Fixed Wireless in Diamond Bar, CA

AT&T logo

Availability:

94.3%

Customer Rating:

 of 5 stars

(0)

Avg. Download Speed

43 Mbps

AT&T offers Fixed Wireless service to 94.3% of Diamond Bar homes. Across the city, AT&T Fixed Wireless is the only type of service available from the company, with speeds up to 43 Mbps, with speeds from 25 Mpbs up to 100 Mbps depending on the address. Upload speeds differ from download speeds, and are as low 3.0 and as high as 20, with an average of 7.2 Mbps throughout the city. AT&T Fixed Wireless is rated other types of internet service available in Diamond Bar from AT&T in terms of customer satisfaction.

Verizon Fixed Wireless in Diamond Bar, CA

Verizon logo

Availability:

62.7%

Customer Rating:

 of 5 stars

(0)

Avg. Download Speed

300 Mbps

Verizon offers Fixed Wireless service to 62.7% of Diamond Bar homes. Across the city, Verizon Fixed Wireless is the only type of service available from the company, with speeds up to 300 Mbps, with speeds from 300 Mpbs up to 300 Mbps depending on the address. Upload speeds differ from download speeds, and are as low 20 and as high as 20, with an average of 20 Mbps throughout the city. Verizon Fixed Wireless is rated other types of internet service available in Diamond Bar from Verizon in terms of customer satisfaction.

Which ISP Should You Choose in Diamond Bar?

The right ISP for you depends upon your needs, but in general we can make the following suggestions:

  • The best all-around internet service provider in Diamond Bar is Verizon.
  • The fastest internet provider should be Frontier Communications. Considering speed for the money and reliability in speeds, Verizon may be a better choice based on real-world local customer feedback.
  • The most affordable internet provider in Diamond Bar is Verizon.
  • Viasat, Spectrum, and HughesNet has the broadest coverage in Diamond Bar, and is most likely to cover your home. To find out exactly what's available at your home, please use our address search tool.

How does Diamond Bar compare to other cities with a similar population?

To see how Diamond Bar stacks up on the national level, it's useful to look at some other cities with similarly sized populations. Below you can see a list of these cities and how they compare to Diamond Bar's B- ISP Report Card and 84 / 100 Digital Connectivity Index.

Chambersburg, PA

  • ISP Report Card: B-
  • Digital Connectivity Index: 55 / 100
Gallatin, TN

  • ISP Report Card: A-
  • Digital Connectivity Index: 72 / 100
Downers Grove, IL

  • ISP Report Card: B
  • Digital Connectivity Index: 83 / 100
Delano, CA

  • ISP Report Card: B-
  • Digital Connectivity Index: 40 / 100
Covington, LA

  • ISP Report Card: B+
  • Digital Connectivity Index: 74 / 100
Ceres, CA

  • ISP Report Card: B-
  • Digital Connectivity Index: 68 / 100
West Sacramento, CA

  • ISP Report Card: B+
  • Digital Connectivity Index: 80 / 100
Westfield, IN

  • ISP Report Card: A-
  • Digital Connectivity Index: 90 / 100
Blacksburg, VA

  • ISP Report Card: B-
  • Digital Connectivity Index: 81 / 100

Customer Reviews

Customer Reviews for Internet Service Providers in California

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