Best Internet Providers in Castlemont, Oakland, CA
All 9 providers, ranked by coverage, speed and customer ratings
Find internet availability by address in Castlemont, Oakland, CA
Castlemont has 9 internet service providers, they are sorted by coverage, available speed, and customer rating from our unbiased internet provider report. Fiber, Cable, DSL, and Fixed Wireless internet are available in the neighborhood. Reviews are grouped by provider and the type of service they offer, covering all 4 available internet technologies in Castlemont.
Ranks compare Castlemont with the 61 neighborhoods in Oakland.
The Best Internet in Castlemont, Oakland, CA at a Glance
Castlemont Internet Providers, Ranked by Coverage, Speed and Customer Ratings
XFINITY
Connection
Customer Rating
Cable
Sonic
Connection
Customer Rating
Fiber
EarthLink
Connection
Customer Rating
Fiber
DSL
Fixed Wireless
AT&T
Connection
Customer Rating
Fiber
DSL
Fixed Wireless
Providers with less than 1% coverage in this neighborhood 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 Castlemont ratings may vary and are shown below.
Who is the Best Internet Provider in Castlemont, Oakland, CA?
Sonic is the best internet provider in Castlemont based on California customer satisfaction ratings and reviews. Based on our extensive and unbiased survey, Sonic had the best reviews at the local, state, and national levels versus all available providers in Castlemont, making it a solid recommendation among providers with reviews. Sonic is an option for 95.99% of the neighborhood.
Which Providers are Available at my Home in Castlemont?
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 Castlemont, Oakland
- AT&T - fiber coverage map
- EarthLink - fiber coverage map
- XFINITY - cable coverage map
- Sonic - fiber coverage map
- GeoLinks - fixed wireless coverage map
- Unwired - fixed wireless coverage map
- Etheric Networks - fixed wireless coverage map
- Verizon - fixed wireless coverage map
- AT&T - dsl coverage map
- EarthLink - dsl coverage map
- T-Mobile Home Internet - fixed wireless coverage map
- AT&T - fixed wireless coverage map
- EarthLink - fixed wireless coverage map
How Castlemont Compares to the Rest of Oakland
Castlemont's report card score is tied 42nd of 61 and its connectivity index is tied 51st of 61.
| Measure | Castlemont | Rank among neighborhoods in Oakland | Oakland | Alameda County | US | Leader |
|---|---|---|---|---|---|---|
| ISP Report Card inputs: what providers offer here | ||||||
| Fiber availability | 96.0% | 38th of 61 | 90.7% | 73.5% | 71.5% | Arroyo Viejo and Clinton and 6 more (100.0%) |
| Average top speed | 4,705 Mbps | 53rd of 61 | 7,941 Mbps | 5,718 Mbps | 3,486 Mbps | Allendale and Clinton and 6 more (10,000 Mbps) |
| Providers at a typical address | 10.7 | Tied 31st of 61 | 10.5 | 10.5 | 7.1 | Bushrod and Temescal (12.3) |
| Connectivity index inputs: how much households need and use the internet | ||||||
| People per household | 3.2 | Tied 9th of 61 | 2.6 | 2.8 | 2.7 | Highland (4.0) |
| Workers who work from home | 5% | 59th of 61 | 25% | 26% | 15% | Piedmont Pines (51%) |
| Homes with a computer, tablet or phone | 97% | Tied 20th of 61 | 96% | 97% | 96% | Caballo Hills and Piedmont Pines (100%) |
| Homes with internet | 89% | Tied 42nd of 61 | 91% | 94% | 91% | Caballo Hills (100%) |
| Homes on fiber, cable or DSL | 64% | 57th of 61 | 77% | 83% | 76% | Caballo Hills (97%) |
| More about the households here | ||||||
| Homes with a desktop or laptop | 70% | Tied 50th of 61 | 81% | 88% | 81% | Merriwood and Montclair (99%) |
| Median household income | $43,641 | 60th of 61 | $110,209 | $142,605 | $93,246 | Montclair ($250,001) |
| Residents in school (6th grade to college) | 21% | 3rd of 61 | 14% | 16% | 16% | Acorn and Coliseum (23%) |
Fiber reaches 96.0% of homes in Castlemont, against 90.7% across Oakland and 73.5% across Alameda County. Households in Castlemont are larger than the US average (3.2 people against 2.7); 5% of workers work from home (US 15%); and the median household income is $43,641 (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 Castlemont
Which Fiber Internet Providers are Available in Castlemont?
Sonic Fiber in Castlemont, Oakland, CA
Availability:
96.0%
Customer Rating:
(14)
Avg. Download Speed
1,000 Mbps
Sonic offers Fiber service to 96.0% of Castlemont homes. Across the neighborhood, Sonic Fiber is the only type of service available from the company, with speeds up to 1,000 Mbps
EarthLink Fiber in Castlemont, Oakland, CA
Availability:
87.6%
Customer Rating:
(6)
Avg. Download Speed
5,000 Mbps
EarthLink offers Fiber service to 87.6% of Castlemont homes. Across the neighborhood, EarthLink Fiber has speeds up to 5,000 Mbps
AT&T Fiber in Castlemont, Oakland, CA
Availability:
87.6%
Customer Rating:
(542)
Avg. Download Speed
5,000 Mbps
AT&T offers Fiber service to 87.6% of Castlemont homes. Across the neighborhood, AT&T Fiber has speeds up to 5,000 Mbps
Which Fixed Wireless and LTE Internet Providers are Available in Castlemont?
Verizon Fixed Wireless in Castlemont, Oakland, CA
Availability:
97.1%
Customer Rating:
(362)
Avg. Download Speed
139 Mbps
Verizon offers Fixed Wireless service to 97.1% of Castlemont homes. Across the neighborhood, Verizon Fixed Wireless is the only type of service available from the company, with speeds up to 139 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 12 Mbps throughout the neighborhood.
T-Mobile Home Internet Fixed Wireless in Castlemont, Oakland, CA
Availability:
93.9%
Customer Rating:
(342)
Avg. Download Speed
47 Mbps
T-Mobile Home Internet offers Fixed Wireless service to 93.9% of Castlemont homes. Across the neighborhood, T-Mobile Home Internet 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 7.9 Mbps throughout the neighborhood.
Unwired Fixed Wireless in Castlemont, Oakland, CA
Availability:
92.9%
Customer Rating:
(1)
Avg. Download Speed
300 Mbps
Unwired offers Fixed Wireless service to 92.9% of Castlemont homes. Across the neighborhood, Unwired Fixed Wireless is the only type of service available from the company, with speeds up to 300 Mbps
Etheric Networks Fixed Wireless in Castlemont, Oakland, CA
Availability:
64.9%
Customer Rating:
(0)
Avg. Download Speed
250 Mbps
Etheric Networks offers Fixed Wireless service to 64.9% of Castlemont homes. Across the neighborhood, Etheric Networks Fixed Wireless is the only type of service available from the company, with speeds up to 250 Mbps
GeoLinks Fixed Wireless in Castlemont, Oakland, CA
Availability:
55.8%
Customer Rating:
(0)
Avg. Download Speed
1,000 Mbps
GeoLinks offers Fixed Wireless service to 55.8% of Castlemont homes. Across the neighborhood, GeoLinks Fixed Wireless is the only type of service available from the company, with speeds up to 1,000 Mbps
EarthLink Fixed Wireless in Castlemont, Oakland, CA
Availability:
36.9%
Customer Rating:
(4)
Avg. Download Speed
25 Mbps
EarthLink offers Fixed Wireless service to 36.9% of Castlemont homes. Across the neighborhood, EarthLink Fixed Wireless has speeds up to 25 Mbps
AT&T Fixed Wireless in Castlemont, Oakland, CA
Availability:
36.9%
Customer Rating:
(205)
Avg. Download Speed
25 Mbps
AT&T offers Fixed Wireless service to 36.9% of Castlemont homes. Across the neighborhood, AT&T Fixed Wireless has speeds up to 25 Mbps
Which Cable Internet Providers are Available in Castlemont?
XFINITY Cable in Castlemont, Oakland, CA
Availability:
97.1%
Customer Rating:
(2077)
Avg. Download Speed
2,000 Mbps
XFINITY from Comcast offers Cable service to 97.1% of Castlemont homes. Across the neighborhood, XFINITY Cable is the only type of service available from the company, with speeds up to 2,000 Mbps
Which DSL Internet Providers are Available in Castlemont?
EarthLink DSL in Castlemont, Oakland, CA
Availability:
94.7%
Customer Rating:
(5)
Avg. Download Speed
86 Mbps
EarthLink offers DSL service to 94.7% of Castlemont homes. Across the neighborhood, EarthLink DSL has speeds up to 86 Mbps, with speeds from 10 Mpbs up to 100 Mbps depending on the address. Upload speeds differ from download speeds, and are as low 1.0 and as high as 20, with an average of 17 Mbps throughout the neighborhood. EarthLink DSL is rated higher than other types of internet service available in Castlemont from EarthLink in terms of customer satisfaction.
AT&T DSL in Castlemont, Oakland, CA
Availability:
94.7%
Customer Rating:
(304)
Avg. Download Speed
86 Mbps
AT&T offers DSL service to 94.7% of Castlemont homes. Across the neighborhood, AT&T DSL has speeds up to 86 Mbps, with speeds from 10 Mpbs up to 100 Mbps depending on the address. Upload speeds differ from download speeds, and are as low 1.0 and as high as 20, with an average of 17 Mbps throughout the neighborhood. AT&T DSL is rated about the same as other types of internet service available in Castlemont from AT&T in terms of customer satisfaction.
How Castlemont Compares to Its Neighbors
The 10 neighborhoods nearest to Castlemont that have their own pages are all within a mile. Among them, Highland has the most homes with fiber (100.0%) and Durant Manor the fewest (93.7%); Castlemont has 96.0%.
| Place | People | Homes with fiber | Average top speed | Providers at a typical address | Report card | Connectivity |
|---|---|---|---|---|---|---|
| Castlemont (this page) | 5,988 | 96.0% | 4,705 Mbps | 10.7 | A | 54/100 |
| Eastmont | 11,258 | 98.4% | 7,081 Mbps | 10 | A | 63/100 |
| North Stonehurst | 5,379 | 99.4% | 6,655 Mbps | 11.1 | A | 50/100 |
| Arroyo Viejo | 4,591 | 100.0% | 5,503 Mbps | 10.5 | A+ | 52/100 |
| Highland | 4,430 | 100.0% | 7,874 Mbps | 10.3 | A+ | 44/100 |
| Webster | 4,305 | 99.1% | 7,033 Mbps | 10 | A | 70/100 |
| Elmhurst Park | 4,234 | 98.1% | 4,983 Mbps | 10.7 | A | 54/100 |
| Cox | 4,178 | 99.2% | 5,000 Mbps | 10.7 | A | 64/100 |
| Fitchburg | 3,827 | 98.3% | 9,931 Mbps | 10 | A | 46/100 |
| Iveywood | 3,232 | 99.0% | 10,000 Mbps | 9 | A | 66/100 |
| Durant Manor | 3,141 | 93.7% | 9,086 Mbps | 9.4 | A | 72/100 |
Who is the Fastest Internet Provider in Castlemont?
According to unbiased feedback from real internet customers, they reported being happiest with speeds provided by Sonic. On the other hand, based on data provided by the internet providers to the FCC, AT&T and EarthLink 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 Castlemont
| AT&T | 5,000 |
|---|---|
| EarthLink | 5,000 |
| XFINITY from Comcast | 2,000 |
| Sonic | 1,000 |
| GeoLinks | 1,000 |
| Verizon | 300 |
| Unwired | 300 |
| Etheric Networks | 250 |
| Viasat | 100 |
| T-Mobile Home Internet | 100 |
| HughesNet | 25 |
How fast is your internet?
Test your connection here and see it next to the speeds providers advertise in Castlemont. It takes about 20 seconds and, on a fast line, can move a few hundred MB of data.
Customer Ratings for Castlemont Internet Providers
Based on 402 reviews from California internet customers, Sonic is the best internet service provider for Castlemont residents. Sonic was rated at an average of 4.43 out of 5 in our report for overall customer satisfaction. T-Mobile Home Internet wins for second-place in California, with 4.11 out of 5 stars and 93.9% coverage in Castlemont.
At a national level, based on 4618 national reviews for any of the providers listed above, Sonic is rated higher than any other provider, with a rating of 4.43 out of 5.
Local, State, and National Ratings for all Castlemont Internet Providers
The table below shows average customer ratings from customers in Castlemont, California, and customers throughout the country.
| ISP / Tech Type | Castlemont Overall | California Overall | National Overall | For Service | ||
|---|---|---|---|---|---|---|
| Sonic | (0) | (14) | (14) | View Plans | ||
| T-Mobile Home Internet | (0) | (27) | (342) | View Plans | ||
| Verizon | (0) | (28) | (816) | View Plans | ||
| HughesNet | (0) | (1) |  (25) | View Plans | ||
| Viasat | (0) | (1) |  (12) | View Plans | ||
| XFINITY | (0) | (211) | (2379) | View Plans | ||
| EarthLink | (0) | (2) | (15) | View Plans | ||
| Unwired | (0) | (1) | (1) | View Plans | ||
| AT&T | (0) | (119) | (1051) | View Plans | ||
| Etheric Networks | (0) | (0) | (0) | View Plans | ||
| GeoLinks | (0) | (0) | (0) | View Plans |
Customer Ratings for Internet Provider Speeds in Castlemont
Based on data reported by Castlemont ISPs to the FCC, the fastest speeds in the neighborhood are available through AT&T and EarthLink. These internet providers offer speeds up to 5,000 Mbps in Castlemont. Therefore, the average customer can get up to 4,518 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 Sonic. This indicates Sonic reliably delivers speeds expected by the customer based on the plan they are paying for.
| ISP / Tech Type | Castlemont Speed | California Speed | National Speed | For Service | ||
|---|---|---|---|---|---|---|
| Sonic | (0) | (14) | (14) | View Plans | ||
| T-Mobile Home Internet | (0) | (27) | (342) | View Plans | ||
| XFINITY | (0) | (211) | (2379) | View Plans | ||
| Verizon | (0) | (28) | (816) | View Plans | ||
| HughesNet | (0) |  (1) | (25) | View Plans | ||
| Unwired | (0) | (1) | (1) | View Plans | ||
| Viasat | (0) | (1) | (12) | View Plans | ||
| AT&T | (0) | (119) | (1051) | View Plans | ||
| EarthLink | (0) | (2) | (15) | View Plans | ||
| Etheric Networks | (0) | (0) | (0) | View Plans | ||
| GeoLinks | (0) | (0) | (0) | View Plans |
Who is the Cheapest Internet Provider in Castlemont?
Of the providers in Castlemont, customers rate T-Mobile Home Internet the best for price. Data comes from customers rating their satisfaction with pricing: in Castlemont 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.
T-Mobile Home Internet is rated 4.26 out of 5 for price, which is higher than the average across all internet providers in the country. Sonic is rated second for affordability, with an average price rating of 4.14 out of 5.
The table below shows how customers in Castlemont, California, and the United States rated the affordability of their internet service.
Rated Affordability in Castlemont
| ISP / Tech Type | Castlemont Affordability | California Affordability | National Affordability | For Service | ||
|---|---|---|---|---|---|---|
| T-Mobile Home Internet | (0) | (27) | (342) | View Plans | ||
| Sonic | (0) | (14) | (14) | View Plans | ||
| Verizon | (0) | (28) | (816) | View Plans | ||
| HughesNet | (0) | (1) | (25) | View Plans | ||
| Viasat | (0) | (1) | (12) | View Plans | ||
| Unwired | (0) | (1) | (1) | View Plans | ||
| EarthLink | (0) | (2) | (15) | View Plans | ||
| AT&T | (0) | (119) | (1051) | View Plans | ||
| XFINITY | (0) | (211) | (2379) | View Plans | ||
| Etheric Networks | (0) | (0) | (0) | View Plans | ||
| GeoLinks | (0) | (0) | (0) | View Plans |
Customer Reviews for Internet Service Providers in California
Customer Reviews
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.
ISPReports User
AT&T DSL
November 08, 2026 Lousy
ISPReports User
Fidium
November 08, 2026 Vernice
Frontier Fiber
November 01, 2026 Horrible this is horrible. My internet has been down for two days in a half. Never again
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Which ISP Should You Choose in Castlemont?
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 Castlemont is Sonic.
- The fastest internet provider should be AT&T and EarthLink. Considering speed for the money and reliability in speeds, Sonic may be a better choice based on real-world local customer feedback.
- The most affordable internet provider in Castlemont is T-Mobile Home Internet.
- XFINITY from Comcast, Viasat, Verizon, HughesNet, EarthLink, and AT&T has the broadest coverage in Castlemont, available to 97.1% 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.