Best Internet Providers in San Marcos, CA
All 8 providers, ranked by coverage, speed and customer ratings
Find internet availability by address in San Marcos, CA
San Marcos has 8 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 city. Reviews are grouped by provider and the type of service they offer, covering all 4 available internet technologies in San Marcos.
Ranks compare San Marcos with the 305 US medium cities (100,000 to 249,999 people), the tiers of our fastest-cities rankings.
The Best Internet in San Marcos, CA at a Glance
San Marcos Internet Providers, Ranked by Coverage, Speed and Customer Ratings
Cox
Connection
Customer Rating
Fiber
Cable
EarthLink
Connection
Customer Rating
Fiber
DSL
Fixed Wireless
AT&T
Connection
Customer Rating
Fiber
DSL
Fixed Wireless
Spectrum
Connection
Customer Rating
Fiber
Cable
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 San Marcos ratings may vary and are shown below.
Who is the Best Internet Provider in San Marcos, CA?
Spectrum is the highest-rated internet provider in San Marcos based on 459 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 1-877-411-1381
Which Providers are Available at my Home in San Marcos?
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 San Marcos
- Cox - cable coverage map
- AT&T - fiber coverage map
- EarthLink - fiber coverage map
- Spectrum - cable coverage map
- San Diego Broadband - fixed wireless coverage map
- Cox - fiber coverage map
- Verizon - fixed wireless coverage map
- AT&T - dsl coverage map
- EarthLink - dsl coverage map
- T-Mobile Home Internet - fixed wireless coverage map
- Spectrum - fiber coverage map
- GeoLinks - fixed wireless coverage map
- AT&T - fixed wireless coverage map
- EarthLink - fixed wireless coverage map
How San Marcos Compares to Places Its Size
San Marcos's report card score is tied 220th of 305 and its connectivity index is tied 32nd of 305.
| Measure | San Marcos | Rank among US medium cities (100,000 to 249,999 people) | San Diego County | California | US | Leader |
|---|---|---|---|---|---|---|
| ISP Report Card inputs: what providers offer here | ||||||
| Fiber availability | 46.2% | 257th of 305 | 59.2% | 62.4% | 71.5% | Overland Park, KS (99.9%) |
| Average top speed | 2,889 Mbps | Tied 215th of 305 | 3,596 Mbps | 3,834 Mbps | 3,486 Mbps | West Valley City, UT (9,708 Mbps) |
| Providers at a typical address | 8.2 | Tied 98th of 305 | 8 | 8 | 7.1 | Carolina, PR (12.6) |
| Connectivity index inputs: how much households need and use the internet | ||||||
| People per household | 3.0 | Tied 54th of 305 | 2.9 | 3.0 | 2.7 | Lakewood, NJ (5.1) |
| Workers who work from home | 21% | Tied 59th of 305 | 19% | 17% | 15% | Frisco, TX (38%) |
| Homes with a computer, tablet or phone | 99% | Tied 1st of 305 | 98% | 97% | 96% | Tied with 45 other places at 99% |
| Homes with internet | 96% | Tied 32nd of 305 | 95% | 94% | 91% | Allen, TX and Cumming, GA and 8 more (98%) |
| Homes on fiber, cable or DSL | 83% | Tied 81st of 305 | 83% | 79% | 76% | Highlands Ranch, CO (92%) |
| More about the households here | ||||||
| Homes with a desktop or laptop | 90% | Tied 59th of 305 | 88% | 84% | 81% | Frisco, TX (96%) |
| Median household income | $127,455 | 40th of 305 | $117,593 | $111,728 | $93,246 | Sunnyvale, CA ($189,225) |
| Residents in school (6th grade to college) | 20% | Tied 39th of 305 | 17% | 17% | 16% | College Station, TX (57%) |
Fiber reaches 46.2% of homes in San Marcos, against 59.2% across San Diego County and 62.4% across California. Households in San Marcos are larger than the US average (3.0 people against 2.7); 21% of workers work from home (US 15%); and the median household income is $127,455 (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 San Marcos
Which Fiber Internet Providers are Available in San Marcos?
EarthLink Fiber in San Marcos, CA
Availability:
38.0%
Customer Rating:
(6)
Avg. Download Speed
4,416 Mbps
EarthLink offers Fiber service to 38.0% of San Marcos homes. Across the city, EarthLink Fiber has speeds up to 4,416 Mbps, with speeds from 1,000 Mpbs up to 5,000 Mbps depending on the address. Upload speeds are symmetrical, meaning they are exactly the same as download speeds for EarthLink Fiber. EarthLink Fiber is rated about the same as other types of internet service available in San Marcos from EarthLink in terms of customer satisfaction.
AT&T Fiber in San Marcos, CA
Availability:
38.0%
Customer Rating:
(542)
Avg. Download Speed
4,416 Mbps
AT&T offers Fiber service to 38.0% of San Marcos homes. Across the city, AT&T Fiber has speeds up to 4,416 Mbps, with speeds from 1,000 Mpbs up to 5,000 Mbps depending on the address. Upload speeds are symmetrical, meaning they are exactly the same as download speeds for AT&T Fiber. AT&T Fiber is rated lower than other types of internet service available in San Marcos from AT&T in terms of customer satisfaction.
Cox Fiber in San Marcos, CA
Availability:
17.8%
Customer Rating:
(54)
Avg. Download Speed
2,000 Mbps
Cox Communications offers Fiber service to 17.8% of San Marcos homes. Across the city, Cox Fiber has speeds up to 2,000 Mbps
Spectrum Fiber in San Marcos, CA
Availability:
4.6%
Customer Rating:
(207)
Avg. Download Speed
1,000 Mbps
Spectrum offers Fiber service to 4.6% of San Marcos homes. Across the city, Spectrum Fiber has speeds up to 1,000 Mbps
Which Fixed Wireless and LTE Internet Providers are Available in San Marcos?
T-Mobile Home Internet Fixed Wireless in San Marcos, CA
Availability:
95.9%
Customer Rating:
(342)
Avg. Download Speed
73 Mbps
T-Mobile Home Internet offers Fixed Wireless service to 95.9% of San Marcos homes. Across the city, T-Mobile Home Internet Fixed Wireless is the only type of service available from the company, with speeds up to 73 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 14 Mbps throughout the city.
Verizon Fixed Wireless in San Marcos, CA
Availability:
93.7%
Customer Rating:
(362)
Avg. Download Speed
291 Mbps
Verizon offers Fixed Wireless service to 93.7% of San Marcos homes. Across the city, Verizon Fixed Wireless is the only type of service available from the company, with speeds up to 291 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 20 Mbps throughout the city.
San Diego Broadband Fixed Wireless in San Marcos, CA
Availability:
85.1%
Customer Rating:
(0)
Avg. Download Speed
500 Mbps
San Diego Broadband offers Fixed Wireless service to 85.1% of San Marcos homes. Across the city, San Diego Broadband Fixed Wireless is the only type of service available from the company, with speeds up to 500 Mbps
EarthLink Fixed Wireless in San Marcos, CA
Availability:
55.0%
Customer Rating:
(4)
Avg. Download Speed
45 Mbps
EarthLink offers Fixed Wireless service to 55.0% of San Marcos homes. Across the city, EarthLink Fixed Wireless has speeds up to 45 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 7.6 Mbps throughout the city.
AT&T Fixed Wireless in San Marcos, CA
Availability:
55.0%
Customer Rating:
(205)
Avg. Download Speed
45 Mbps
AT&T offers Fixed Wireless service to 55.0% of San Marcos homes. Across the city, AT&T Fixed Wireless has speeds up to 45 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 7.6 Mbps throughout the city.
GeoLinks Fixed Wireless in San Marcos, CA
Availability:
5.7%
Customer Rating:
(0)
Avg. Download Speed
637 Mbps
GeoLinks offers Fixed Wireless service to 5.7% of San Marcos homes. Across the city, GeoLinks Fixed Wireless is the only type of service available from the company, with speeds up to 637 Mbps, with speeds from 200 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 San Marcos?
Cox Cable in San Marcos, CA
Availability:
89.5%
Customer Rating:
(399)
Avg. Download Speed
1,980 Mbps
Cox Communications offers Cable service to 89.5% of San Marcos homes. Across the city, Cox Cable has speeds up to 1,980 Mbps, with speeds from 1,000 Mpbs up to 2,000 Mbps depending on the address. Upload speeds differ from download speeds, and are as low 35 and as high as 500, with an average of 141 Mbps throughout the city. Cox Cable is rated about the same as other types of internet service available in San Marcos from Cox in terms of customer satisfaction.
Spectrum Cable in San Marcos, CA
Availability:
50.8%
Customer Rating:
(1739)
Avg. Download Speed
1,000 Mbps
Spectrum offers Cable service to 50.8% of San Marcos homes. Across the city, Spectrum Cable has speeds up to 1,000 Mbps
Which DSL Internet Providers are Available in San Marcos?
EarthLink DSL in San Marcos, CA
Availability:
88.8%
Customer Rating:
(5)
Avg. Download Speed
86 Mbps
EarthLink offers DSL service to 88.8% of San Marcos homes. Across the city, 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 18 Mbps throughout the city. EarthLink DSL is rated higher than other types of internet service available in San Marcos from EarthLink in terms of customer satisfaction.
AT&T DSL in San Marcos, CA
Availability:
88.8%
Customer Rating:
(304)
Avg. Download Speed
86 Mbps
AT&T offers DSL service to 88.8% of San Marcos homes. Across the city, 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 18 Mbps throughout the city. AT&T DSL is rated about the same as other types of internet service available in San Marcos from AT&T in terms of customer satisfaction.
Internet in San Marcos by Neighborhood and ZIP Code
San Marcos has 1 neighborhood and 2 ZIP codes with their own pages. Each row links to that place’s page.
Neighborhoods in San Marcos
| Neighborhood | People | Homes with fiber | Average top speed | Providers at a typical address | Report card | Connectivity |
|---|---|---|---|---|---|---|
| University Commons | 4,959 | 75.7% | 3,860 Mbps | 8.3 | B+ | 85/100 |
ZIP codes in San Marcos
How San Marcos Compares to Nearby Places
The 10 places nearest to San Marcos that have their own pages are all within 11 miles. Among them, Solana Beach has the most homes with fiber (99.8%) and Bonsall the fewest (33.9%); San Marcos has 46.2%.
| Place | People | Homes with fiber | Average top speed | Providers at a typical address | Report card | Connectivity |
|---|---|---|---|---|---|---|
| San Marcos (this page) | 104,736 | 46.2% | 2,889 Mbps | 8.2 | B | 88/100 |
| Oceanside | 188,289 | 40.2% | 2,814 Mbps | 7.4 | B- | 88/100 |
| Escondido | 180,275 | 34.3% | 2,787 Mbps | 7.9 | B- | 80/100 |
| Vista | 116,648 | 50.4% | 3,123 Mbps | 8.2 | B | 87/100 |
| Carlsbad | 96,482 | 57.7% | 2,438 Mbps | 8 | B | 89/100 |
| Encinitas | 52,157 | 74.1% | 2,946 Mbps | 9 | B+ | 86/100 |
| Sunny Vista | 17,031 | 35.1% | 2,086 Mbps | 7.6 | B- | 93/100 |
| Solana Beach | 12,931 | 99.8% | 5,005 Mbps | 11.5 | A | 78/100 |
| Cardiff By The Sea | 11,512 | 96.8% | 3,782 Mbps | 9.5 | A- | 87/100 |
| Rancho Santa Fe | 11,330 | 78.7% | 1,501 Mbps | 8.4 | B | 87/100 |
| Bonsall | 6,775 | 33.9% | 1,912 Mbps | 8.2 | B- | 84/100 |
Who is the Fastest Internet Provider in San Marcos?
Based on both FCC data and unbiased customer ratings, the fastest internet in the city comes from Cox Communications.
Data Reported to FCC by ISPs: Average Maximum Available in San Marcos
| AT&T | 5,000 |
|---|---|
| EarthLink | 5,000 |
| Cox Communications | 2,000 |
| Spectrum | 1,000 |
| GeoLinks | 1,000 |
| San Diego Broadband | 500 |
| Verizon | 300 |
| T-Mobile Home Internet | 100 |
| Viasat | 100 |
| HughesNet | 25 |
How fast is your internet?
Test your connection here and see it next to the speeds providers advertise in San Marcos. It takes about 20 seconds and, on a fast line, can move a few hundred MB of data.
Customer Ratings for San Marcos Internet Providers
Based on 459 reviews from California internet customers, Spectrum is the best internet service provider for San Marcos residents. Spectrum was rated at an average of 3.27 out of 5 in our report for overall customer satisfaction. EarthLink wins for second-place in California, with 2.50 out of 5 stars and 94.2% coverage in San Marcos.
At a national level, based on 4626 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 San Marcos Internet Providers
The table below shows average customer ratings from customers in San Marcos, California, and customers throughout the country.
| ISP / Tech Type | San Marcos Overall | California Overall | National Overall | For Service | ||
|---|---|---|---|---|---|---|
| EarthLink | (0) |  (2) | (15) | View Plans | ||
| HughesNet | (0) | (1) | (25) | View Plans | ||
| Spectrum | (0) | (228) | (1949) | View Plans | ||
| T-Mobile Home Internet | (0) | (27) | (342) | View Plans | ||
| Verizon | (0) | (28) | (816) | View Plans | ||
| Viasat | (0) | (1) |  (12) | View Plans | ||
| Cox | (1) | (55) | (453) | View Plans | ||
| AT&T |  (1) | (119) | (1051) | View Plans | ||
| San Diego Broadband | (0) | (0) | (0) | View Plans | ||
| GeoLinks | (0) | (0) | (0) | View Plans |
Customer Ratings for Internet Provider Speeds in San Marcos
Based on data reported by San Marcos ISPs to the FCC, the fastest speeds in the city are available through Cox Communications. The company offers speeds up to 2,000 Mbps in San Marcos. Therefore, the average customer can get up to 1,981 Mbps if they’re willing to purchase the fastest subscription tier available at their homes.
Additionally, actual customers rated their satisfaction with internet speed highest with Cox Communications. This indicates Cox reliably delivers speeds expected by the customer based on the plan they are paying for.
| ISP / Tech Type | San Marcos Speed | California Speed | National Speed | For Service | ||
|---|---|---|---|---|---|---|
| Cox |  (1) | (55) | (453) | View Plans | ||
| EarthLink | (0) |  (2) | (15) | View Plans | ||
| HughesNet | (0) | (1) | (25) | View Plans | ||
| Spectrum | (0) | (228) | (1949) | View Plans | ||
| T-Mobile Home Internet | (0) | (27) | (342) | View Plans | ||
| Verizon | (0) | (28) | (816) | View Plans | ||
| Viasat | (0) | (1) | (12) | View Plans | ||
| AT&T | (1) | (119) | (1051) | View Plans | ||
| San Diego Broadband | (0) | (0) | (0) | View Plans | ||
| GeoLinks | (0) | (0) | (0) | View Plans |
Who is the Cheapest Internet Provider in San Marcos?
Of the providers in San Marcos, customers rate Spectrum the best for price. Data comes from customers rating their satisfaction with pricing: in San Marcos 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.
Spectrum is rated 2.88 out of 5 for price, which is much lower than the average across all internet providers in the country. EarthLink is rated second for affordability, with an average price rating of 2.00 out of 5.
The table below shows how customers in San Marcos, California, and the United States rated the affordability of their internet service.
Rated Affordability in San Marcos
| ISP / Tech Type | San Marcos Affordability | California Affordability | National Affordability | For Service | ||
|---|---|---|---|---|---|---|
| EarthLink | (0) | (2) | (15) | View Plans | ||
| HughesNet | (0) | (1) | (25) | View Plans | ||
| Spectrum | (0) | (228) | (1949) | View Plans | ||
| T-Mobile Home Internet | (0) |  (27) | (342) | View Plans | ||
| Verizon | (0) | (28) | (816) | View Plans | ||
| Viasat | (0) | (1) | (12) | View Plans | ||
| AT&T | (1) | (119) | (1051) | View Plans | ||
| Cox | (1) | (55) | (453) | View Plans | ||
| San Diego Broadband | (0) | (0) | (0) | View Plans | ||
| GeoLinks | (0) | (0) | (0) | View Plans |
Customer Reviews for Internet Service Providers in California
Customer Reviews
A San Marcos, CA Customer
Cox Cable
March 04, 2023 Jane S
AT&T DSL
February 18, 2023 The internet seems to really bog down at certain times of the day. I work from home as does my spouse so we rely on our internet extensively. There is a very noticeable lag in load speeds as the day goes on. From about 1:30 pm on I generally have to be very patient while things that should load immediately slowly load up. It can be incredibly frustrating actually.
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
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Which ISP Should You Choose in San Marcos?
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 San Marcos is Spectrum.
- The fastest internet provider should be Cox Communications. Considering speed for the money and reliability in speeds, Cox Communications may be a better choice based on real-world local customer feedback.
- The most affordable internet provider in San Marcos is Spectrum.
- Viasat, T-Mobile Home Internet, and HughesNet has the broadest coverage in San Marcos, available to 95.9% 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.