7 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 Card | B- | |
| Download Speed for Most Households | 4,088 Mbps | |
| Number of Internet Service Providers | 7 | |
| Real Diamond Bar Customer Ratings | 3 |
This page reflects the most recent FCC update from September 03, 2026, based on the Broadband Data Collection as of December 31, 2025.
This page reflects the most recent FCC update from September 03, 2026, based on the Broadband Data Collection as of December 31, 2025.
Diamond Bar has 7 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
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Diamond Bar has 7 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
Connection
Customer Rating
Fiber
Cable
Frontier
Connection
Customer Rating
Fiber
DSL
EarthLink
Connection
Customer Rating
Fixed Wireless
T-Mobile Home Internet
Connection
Customer Rating
Fixed Wireless
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.
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 highest-rated internet provider in Diamond Bar based on 438 California customer reviews, and T-Mobile Home Internet has the highest rating nationwide. The provider information above and the information immediately below can help you decide. Compare provider ratings and review counts above.
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
Local, State, and National Ratings for all Diamond Bar Internet Providers
| ISP / Tech Type | Diamond Bar Overall | California Overall | National Overall | For Service | ||
|---|---|---|---|---|---|---|
| Verizon | (1) | (26) | (783) | View Plans | ||
| Spectrum | (2) | (221) | (1881) | View Plans | ||
| T-Mobile Home Internet | (0) | (26) | (322) | View Plans | ||
| Frontier | (0) | (48) | (169) | View Plans | ||
| AT&T | (0) | (115) | (1007) | View Plans | ||
| HughesNet | (0) | (1) | (24) | View Plans | ||
| Viasat | (0) | (1) | (12) | View Plans | ||
| EarthLink | (0) | (2) | (15) | View Plans | ||
| GeoLinks | (0) | (0) | (0) | View Plans |
Based on 438 reviews from California internet customers, Verizon is the best internet service provider for Diamond Bar residents. Verizon was rated at an average of 3.65 out of 5 in our report for overall customer satisfaction. Spectrum wins for second-place in California, with 3.50 out of 5 stars and 99.9% coverage in Diamond Bar.
At a national level, based on 4177 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?
a different provider.
Coverage map for each provider in Diamond Bar
- Frontier - fiber coverage map
- Spectrum - cable coverage map
- Verizon - fixed wireless coverage map
- Spectrum - fiber coverage map
- T-Mobile Home Internet - fixed wireless coverage map
- GeoLinks - fixed wireless coverage map
- EarthLink - fixed wireless coverage map
- AT&T - fixed wireless coverage map
- Frontier - dsl coverage map

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
| ISP / Tech Type | Max Advertised Speed | ||
|---|---|---|---|
| Frontier Communications | 7,000 Mbps | ||
| GeoLinks | 1,000 Mbps | ||
| Spectrum | 1,000 Mbps | ||
| Verizon | 300 Mbps | ||
| EarthLink | 100 Mbps | ||
| AT&T | 100 Mbps | ||
| T-Mobile Home Internet | 100 Mbps | ||
| Viasat | 100 Mbps | ||
| HughesNet | 25 Mbps |
Customer Ratings for Internet Provider Speeds in Diamond Bar
| ISP / Tech Type | Diamond Bar Speed | California Speed | National Speed | For Service | ||
|---|---|---|---|---|---|---|
| Verizon | (1) | (26) | (783) | View Plans | ||
| Spectrum | (2) | (221) | (1881) | View Plans | ||
| Frontier | (0) | (48) | (169) | View Plans | ||
| T-Mobile Home Internet | (0) | (26) | (322) | View Plans | ||
| AT&T | (0) | (115) | (1007) | View Plans | ||
| HughesNet | (0) | (1) | (24) | View Plans | ||
| Viasat | (0) | (1) | (12) | View Plans | ||
| EarthLink | (0) | (2) | (15) | View Plans | ||
| GeoLinks | (0) | (0) | (0) | 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 5,062 Mbps if they’re willing to purchase the fastest subscription tier available at their homes.
However, 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 much 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 3.50 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
| ISP / Tech Type | Diamond Bar Affordability | California Affordability | National Affordability | For Service | ||
|---|---|---|---|---|---|---|
| Verizon | (1) | (26) | (783) | View Plans | ||
| Spectrum | (2) | (221) | (1881) | View Plans | ||
| T-Mobile Home Internet | (0) | (26) | (322) | View Plans | ||
| Frontier | (0) | (48) | (169) | View Plans | ||
| AT&T | (0) | (115) | (1007) | View Plans | ||
| HughesNet | (0) | (1) | (24) | View Plans | ||
| Viasat | (0) | (1) | (12) | View Plans | ||
| EarthLink | (0) | (2) | (15) | View Plans | ||
| GeoLinks | (0) | (0) | (0) | 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.
| Metric
(hover for details)
|
Diamond Bar | California | USA | ||
|---|---|---|---|---|---|
| Fiber Availability Percent The percentage of households in Diamond Bar that have a Fiber internet connection available to their home. | 54.51% | 62.40% | 71.53% | ||
| Average Download SpeedThe maximum download speed most households can get on average. This is measured by availability in a block group and weighted by the population in that area. | 4,088 Mbps | 3,835 Mbps | 3,583 Mbps | ||
| Provider CountThe number of providers available for most people. This is a weighted average by block rather than a total for Diamond Bar. | 5.8 | 8.0 | 7.1 |
| Average Household SizeA larger household size in a city indicates that there will be a greater need for bandwidth due to simultaneous usage, multiple devices, and network congestion. | 3.0 | 3.0 | 2.7 | ||
| Work From Home PercentA higher percent of the population working from home indicates bandwidth requirements being more widely needed rather than consolidated to commercial portions of the city. | 19% | 17% | 15% | ||
| Households with DevicesA higher percentage of households with computing devices in the home indicates a higher level of infrastructure needed to support those households. | 99% | 97% | 96% | ||
| Households with InternetA higher percentage of households with internet indicates a higher need for usage and connectivity in people’s daily lives. | 96% | 94% | 91% | ||
| Households with BroadbandA higher percentage of households with a broadband connection (defined as speeds above 25 Mbps) indicates heavier usage needs within these households. | 79% | 79% | 76% | ||
| Broadband Usage vs. AvailabilityThis measures what percentage of households who have a broadband connection to their home actually have an active subscription to that service. | 79% | 80% | 77% |
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.
96% 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?
- ISP Report Card: B
- Digital Connectivity Index: 84 / 100
- ISP Report Card: B
- Digital Connectivity Index: 78 / 100
- ISP Report Card: B-
- Digital Connectivity Index: 70 / 100
- ISP Report Card: B+
- Digital Connectivity Index: 71 / 100
- ISP Report Card: B
- Digital Connectivity Index: 91 / 100
- ISP Report Card: B-
- Digital Connectivity Index: 69 / 100
- ISP Report Card: B
- Digital Connectivity Index: 86 / 100
- ISP Report Card: B
- Digital Connectivity Index: 81 / 100
- ISP Report Card: B
- Digital Connectivity Index: 78 / 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 $110,174 which is higher than the California average of $111,728 and much higher than the national average of $93,246. 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, 19% of residents work from home, which is higher than the 17% 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, 95% 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 Communications offers Fiber service to 51.4% of Diamond Bar homes. Across the city, Frontier Fiber has speeds up to 7,000 Mbps
Spectrum Fiber in Diamond Bar, CA
Spectrum offers Fiber service to 10.9% of Diamond Bar homes. Across the city, Spectrum Fiber has speeds up to 1,000 Mbps
Which Cable Internet Providers are Available in Diamond Bar?
Spectrum Cable in Diamond Bar, CA
Spectrum offers Cable service to 99.9% of Diamond Bar homes. Across the city, Spectrum Cable has speeds up to 1,000 Mbps
Which DSL Internet Providers are Available in Diamond Bar?
Frontier DSL in Diamond Bar, CA
Frontier Communications offers DSL service to 25.5% 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 higher 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 offers Fixed Wireless service to 97.8% 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 91 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.
EarthLink Fixed Wireless in Diamond Bar, CA
EarthLink offers Fixed Wireless service to 93.8% of Diamond Bar homes. Across the city, EarthLink Fixed Wireless is the only type of service available from the company, with speeds up to 47 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 8.1 Mbps throughout the city.
AT&T Fixed Wireless in Diamond Bar, CA
AT&T offers Fixed Wireless service to 93.8% 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 47 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 8.1 Mbps throughout the city.
Verizon Fixed Wireless in Diamond Bar, CA
Verizon offers Fixed Wireless service to 84.9% of Diamond Bar homes. Across the city, Verizon Fixed Wireless is the only type of service available from the company, with speeds up to 234 Mbps, with speeds from 25 Mpbs up to 300 Mbps depending on the address. Upload speeds differ from download speeds, and are as low 6.0 and as high as 20, with an average of 17 Mbps throughout the city.
GeoLinks Fixed Wireless in Diamond Bar, CA
GeoLinks offers Fixed Wireless service to 26.0% of Diamond Bar homes. Across the city, GeoLinks Fixed Wireless is the only type of service available from the company, with speeds up to 277 Mbps, with speeds from 100 Mpbs up to 1,000 Mbps depending on the address. Upload speeds are symmetrical, meaning they are exactly the same as download speeds for GeoLinks Fixed Wireless.
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.
- ISP Report Card: B
- Digital Connectivity Index: 57 / 100
- ISP Report Card: A-
- Digital Connectivity Index: 72 / 100
- ISP Report Card: B
- Digital Connectivity Index: 82 / 100
- ISP Report Card: B-
- Digital Connectivity Index: 48 / 100
- ISP Report Card: B+
- Digital Connectivity Index: 73 / 100
- ISP Report Card: B-
- Digital Connectivity Index: 66 / 100
- ISP Report Card: B+
- Digital Connectivity Index: 80 / 100
- ISP Report Card: A-
- Digital Connectivity Index: 90 / 100
- ISP Report Card: C+
- Digital Connectivity Index: 79 / 100
Customer Reviews
Customer Reviews for Internet Service Providers in Diamond Bar
Customer Reviews
A Diamond Bar, CA Customer
Verizon Fiber
January 02, 2023 More
Nick L.
Spectrum Cable
December 22, 2025 Spectrum is a moderately solid ISP. They occasionally have short outages that last a minute. This occurs maybe once every few days. For the most part, the speed is as advertised with good connection. The pricing is fair, however, this is after I had to negotiate with their customer service. If you don't regularly negotiate price with them, then pricing can be quite high. Their customer service is friendly and helpful, but they do upsell quite heavily. Overall, decent service at a decent price.
More
A Walnut, CA Customer
Spectrum Cable
February 12, 2023 More
ISPReports User
Fidium Fiber
September 29, 2026 More
ISPReports User
XFINITY
September 28, 2026 More
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