Best Internet Providers in Diamond Bar, CA
All 7 providers, ranked by coverage, speed and customer ratings
Find internet availability by address in Diamond Bar, CA
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.
Ranks compare Diamond Bar with the 749 US small cities (50,000 to 99,999 people), the tiers of our fastest-cities rankings.
The Best Internet in Diamond Bar, CA at a Glance
Diamond Bar Internet 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
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.
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 455 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.
or call 1-833-213-7018
Which Providers are Available at my Home in Diamond Bar?
Coverage changes block by block. Pick a provider and a technology to see where its service reaches: the darker the area, the larger the share of homes it covers. For your exact address, use the address search above.
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
- AT&T - fixed wireless coverage map
- EarthLink - fixed wireless coverage map
- Frontier - dsl coverage map
How Diamond Bar Compares to Places Its Size
Diamond Bar's report card score is tied 654th of 749 and its connectivity index is tied 164th of 749.
| Measure | Diamond Bar | Rank among US small cities (50,000 to 99,999 people) | Los Angeles County | California | US | Leader |
|---|---|---|---|---|---|---|
| ISP Report Card inputs: what providers offer here | ||||||
| Fiber availability | 54.5% | 596th of 749 | 75.3% | 62.4% | 71.5% | Aloha, OR and Shawnee, KS (100.0%) |
| Average top speed | 4,088 Mbps | 292nd of 749 | 4,064 Mbps | 3,834 Mbps | 3,486 Mbps | Layton, UT (9,808 Mbps) |
| Providers at a typical address | 5.8 | Tied 664th of 749 | 7.7 | 8 | 7.1 | Guaynabo, PR (14.3) |
| Connectivity index inputs: how much households need and use the internet | ||||||
| People per household | 3.0 | Tied 120th of 749 | 3.0 | 3.0 | 2.7 | Pacoima, CA and Spring Valley, NY (4.3) |
| Workers who work from home | 19% | Tied 217th of 749 | 17% | 17% | 15% | Danville, CA and Potomac, MD and 2 more (39%) |
| Homes with a computer, tablet or phone | 99% | Tied 11th of 749 | 97% | 97% | 96% | Atascocita, TX and Eastvale, CA and 8 more (100%) |
| Homes with internet | 96% | Tied 96th of 749 | 93% | 94% | 91% | Centreville, VA and Danville, CA and 2 more (99%) |
| Homes on fiber, cable or DSL | 79% | Tied 392nd of 749 | 78% | 79% | 76% | Flower Mound, TX and Johns Creek, GA and 1 more (93%) |
| More about the households here | ||||||
| Homes with a desktop or laptop | 92% | Tied 88th of 749 | 82% | 84% | 81% | Sammamish, WA (99%) |
| Median household income | $110,174 | 247th of 749 | $100,015 | $111,728 | $93,246 | Potomac, MD ($227,882) |
| Residents in school (6th grade to college) | 18% | Tied 144th of 749 | 17% | 17% | 16% | East Lansing, MI (58%) |
Fiber reaches 54.5% of homes in Diamond Bar, against 75.3% across Los Angeles County and 62.4% across California. Households in Diamond Bar are larger than the US average (3.0 people against 2.7); 19% of workers work from home (US 15%); and the median household income is $110,174 (US $93,246).
Our demographic data is sourced from the latest 5-year release of the American Community Survey by the US Census Bureau.
Fiber, 5G, Cable and DSL Internet in Diamond Bar
Which Fiber Internet Providers are Available in Diamond Bar?
Frontier Fiber in Diamond Bar, CA
Availability:
51.4%
Customer Rating:
(119)
Avg. Download Speed
7,000 Mbps
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
Availability:
10.9%
Customer Rating:
(207)
Avg. Download Speed
1,000 Mbps
Spectrum offers Fiber service to 10.9% of Diamond Bar homes. Across the city, Spectrum Fiber has speeds up to 1,000 Mbps
Which Fixed Wireless and LTE Internet Providers are Available in Diamond Bar?
T-Mobile Home Internet Fixed Wireless in Diamond Bar, CA
Availability:
97.8%
Customer Rating:
(342)
Avg. Download Speed
91 Mbps
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
Availability:
93.8%
Customer Rating:
(4)
Avg. Download Speed
47 Mbps
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
Availability:
93.8%
Customer Rating:
(205)
Avg. Download Speed
47 Mbps
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
Availability:
84.9%
Customer Rating:
(362)
Avg. Download Speed
234 Mbps
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
Availability:
26.0%
Customer Rating:
(0)
Avg. Download Speed
277 Mbps
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 Cable Internet Providers are Available in Diamond Bar?
Spectrum Cable in Diamond Bar, CA
Availability:
99.9%
Customer Rating:
(1739)
Avg. Download Speed
1,000 Mbps
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
Availability:
25.5%
Customer Rating:
(58)
Avg. Download Speed
11 Mbps
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.
Internet in Diamond Bar by Neighborhood and ZIP Code
Diamond Bar has 1 neighborhood and 1 ZIP code with their own pages. Each row links to that place’s page.
Neighborhoods in Diamond Bar
| Neighborhood | People | Homes with fiber | Average top speed | Providers at a typical address | Report card | Connectivity |
|---|---|---|---|---|---|---|
| Walnut Valley | 39,397 | 64.3% | 4,562 Mbps | 5.9 | B- | 86/100 |
ZIP codes in Diamond Bar
| ZIP code | People | Homes with fiber | Average top speed | Providers at a typical address | Report card | Connectivity |
|---|---|---|---|---|---|---|
| 91765 | 47,498 | 50.9% | 3,888 Mbps | 5.9 | B- | 83/100 |
How Diamond Bar Compares to Nearby Places
The 10 places nearest to Diamond Bar that have their own pages are all within 7 miles. Among them, Valinda has the most homes with fiber (97.8%) and Brea the fewest (54.7%); Diamond Bar has 54.5%.
| Place | People | Homes with fiber | Average top speed | Providers at a typical address | Report card | Connectivity |
|---|---|---|---|---|---|---|
| Diamond Bar (this page) | 54,709 | 54.5% | 4,088 Mbps | 5.8 | B- | 84/100 |
| Pomona | 154,267 | 96.5% | 6,508 Mbps | 6.1 | B+ | 71/100 |
| West Covina | 104,328 | 87.6% | 5,339 Mbps | 5.8 | B | 81/100 |
| Chino Hills | 79,721 | 94.6% | 6,632 Mbps | 5.4 | B | 91/100 |
| Rowland Heights | 48,375 | 83.5% | 4,654 Mbps | 5.8 | B | 78/100 |
| Brea | 48,249 | 54.7% | 2,718 Mbps | 8.3 | B | 86/100 |
| San Dimas | 37,779 | 81.1% | 5,835 Mbps | 6.1 | B | 78/100 |
| Walnut | 30,033 | 82.0% | 5,608 Mbps | 5.9 | B | 84/100 |
| Valinda | 23,956 | 97.8% | 6,871 Mbps | 4.9 | B+ | 77/100 |
| South San Jose Hills | 22,950 | 86.2% | 3,929 Mbps | 5.3 | B- | 70/100 |
| Industry | 654 | 72.8% | 3,922 Mbps | 5.3 | B- | 69/100 |
Who is the Fastest Internet Provider in Diamond Bar?
According to unbiased feedback from real internet customers, 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
| Frontier Communications | 7,000 |
|---|---|
| Spectrum | 1,000 |
| GeoLinks | 1,000 |
| Verizon | 300 |
| Viasat | 100 |
| T-Mobile Home Internet | 100 |
| AT&T | 100 |
| EarthLink | 100 |
| HughesNet | 25 |
How fast is your internet?
Test your connection here and see it next to the speeds providers advertise in Diamond Bar. It takes about 20 seconds and, on a fast line, can move a few hundred MB of data.
Customer Ratings for Diamond Bar Internet Providers
Based on 455 reviews from California internet customers, Verizon is the best internet service provider for Diamond Bar residents. Verizon was rated at an average of 3.61 out of 5 in our report for overall customer satisfaction. AT&T wins for second-place in California, with 3.34 out of 5 stars and 93.8% coverage in Diamond Bar.
At a national level, based on 4350 national reviews for any of the providers listed above, T-Mobile Home Internet is rated higher than any other provider, with a rating of 4.02 out of 5.
Local, State, and National Ratings for all Diamond Bar Internet Providers
The table below shows average customer ratings from customers in Diamond Bar, California, and customers throughout the country.
| ISP / Tech Type | Diamond Bar Overall | California Overall | National Overall | For Service | ||
|---|---|---|---|---|---|---|
| Verizon |  (1) | (28) | (816) | View Plans | ||
| AT&T | (0) | (119) | (1051) | View Plans | ||
| EarthLink | (0) | (2) | (15) | View Plans | ||
| Frontier | (0) | (51) | (177) | View Plans | ||
| HughesNet | (0) |  (1) | (25) | View Plans | ||
| T-Mobile Home Internet | (0) | (27) | (342) | View Plans | ||
| Viasat | (0) | (1) |  (12) | View Plans | ||
| Spectrum | (2) | (228) | (1949) | View Plans | ||
| GeoLinks | (0) | (0) | (0) | View Plans |
Customer Ratings for Internet Provider Speeds in Diamond Bar
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 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.
| ISP / Tech Type | Diamond Bar Speed | California Speed | National Speed | For Service | ||
|---|---|---|---|---|---|---|
| Verizon | (1) | (28) | (816) | View Plans | ||
| AT&T | (0) | (119) | (1051) | View Plans | ||
| EarthLink | (0) |  (2) | (15) | View Plans | ||
| Frontier | (0) | (51) | (177) | View Plans | ||
| HughesNet | (0) |  (1) | (25) | View Plans | ||
| T-Mobile Home Internet | (0) | (27) | (342) | View Plans | ||
| Viasat | (0) | (1) | (12) | View Plans | ||
| Spectrum | (2) | (228) | (1949) | View Plans | ||
| GeoLinks | (0) | (0) | (0) | View Plans |
Who is the Cheapest Internet Provider in Diamond Bar?
Of the providers in Diamond Bar, customers rate Verizon the best for price. Data comes from customers rating their satisfaction with pricing: in Diamond Bar where enough of them have reviewed a provider, otherwise across California or the country. This feedback is valuable because it considers price changes and whether the speeds paid for are worth it.
Verizon is rated 5.00 out of 5 for price, which is much higher than the average across all internet providers in the country. AT&T is rated second for affordability, with an average price rating of 3.22 out of 5.
The table below shows 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) | (28) | (816) | View Plans | ||
| AT&T | (0) | (119) | (1051) | View Plans | ||
| EarthLink | (0) | (2) | (15) | View Plans | ||
| Frontier | (0) | (51) | (177) | View Plans | ||
| HughesNet | (0) | (1) | (25) | View Plans | ||
| T-Mobile Home Internet | (0) |  (27) | (342) | View Plans | ||
| Viasat | (0) | (1) | (12) | View Plans | ||
| Spectrum | (2) | (228) | (1949) | View Plans | ||
| GeoLinks | (0) | (0) | (0) | View Plans |
Customer Reviews for Internet Service Providers in California
Customer Reviews
A Diamond Bar, CA Customer
Verizon Fiber
January 02, 2023 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.
A Walnut, CA Customer
Spectrum Cable
February 12, 2023 Steve
ting Fiber
November 13, 2026 Slow, 1/10th the speed they advertised
Robert
Verizon Fixed Wireless
November 10, 2026 Was cut off with .out notice due to upgrade and was not provided connection to upgrade from the same location (tower). Causing further problems in service and added cost.
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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, available to 99.9% of homes, and is most likely to cover your home. To find out exactly what’s available at your home, please use our address search tool.