Cell phone coverage map for Mercer Island, WA
Zoom in for local detail. Tap or click a colored area to see coverage and signal details. On mobile, use two fingers to move the map.
Map data © OpenStreetMap contributors, © CARTO. Rendered with MapLibre. FCC BDC mobile coverage processed by Carrierlytics.
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Cell phone coverage rankings by network in Mercer Island, WA
T-Mobile
- Overall
- 100.0%
- 4G LTE
- 100.0% avg. -85 dBm 4G LTE signal where 4G LTE coverage exists: avg. -85 dBm
- 5G
- 100.0% avg. -84 dBm 5G signal where 5G coverage exists: avg. -84 dBm
- Fast 5G
- 91.1% avg. -83 dBm Fast 5G signal where Fast 5G coverage exists: avg. -83 dBm
Verizon
- Overall
- 100.0%
- 4G LTE
- 100.0% avg. -82 dBm 4G LTE signal where 4G LTE coverage exists: avg. -82 dBm
- 5G
- 92.8% avg. -92 dBm 5G signal where 5G coverage exists: avg. -92 dBm
- Fast 5G
- 85.6% avg. -91 dBm Fast 5G signal where Fast 5G coverage exists: avg. -91 dBm
AT&T
- Overall
- 95.6%
- 4G LTE
- 95.0% avg. -93 dBm 4G LTE signal where 4G LTE coverage exists: avg. -93 dBm
- 5G
- 90.0% avg. -103 dBm 5G signal where 5G coverage exists: avg. -103 dBm
- Fast 5G
- 52.8% avg. -97 dBm Fast 5G signal where Fast 5G coverage exists: avg. -97 dBm
County coverage is shown for surrounding-area context and uses land-area only coverage.
Coverage varies by neighborhood. Your carrier shouldn’t.
US Mobile lets you switch between all three major networks, so you can choose the one that works best where you actually use your phone.
Pricing, network access, switching terms, and home internet availability may vary.
Best phone plans for Mercer Island, WA
Best phone plans on T-Mobile's network for Mercer Island, WA
Metro by T-Mobile $30 BYOD Unlimited plan
Strong Value
- Price
- $30/mo
- Data
- Unlimited
- Hotspot
- 10GB
Flex Mobile Unlimited Plus
Niche Value
- Price
- $44/mo
- Data
- 100GB
- Hotspot
- 100GB
T-Mobile Better Value
Fair Value
- Price
- $140.01/mo for 3 lines ($46.67/line)
- Data
- Unlimited
- Hotspot
- Unlimited
US Mobile By the Gig 2GB Light Speed
Elite Value
- Price
- $10/mo
- Data
- 2GB
- Hotspot
- 2GB
US Mobile Annual Unlimited Starter 70GB Light Speed
Fair Value
- Price
- $22.5/mo
- Data
- 70GB
- Hotspot
- 10GB
Coverage by ZIP code in Mercer Island, WA
ZIP code areas can extend beyond city limits, so this table is best used for local comparison around the city.
| ZIP Code | AT&T | T-Mobile | Verizon |
|---|---|---|---|
| 98040 | 95.6% 95.0% 90.0% 52.8% | 100.0% 100.0% 100.0% 91.1% | 100.0% 100.0% 92.8% 85.6% |
About The Coverage Data
Coverage and signal estimates are derived by Carrierlytics from carrier-reported data in the FCC’s National Broadband Coverage Map, last updated in June 2025. “Percent covered” shows how much of the city or ZIP code area has a carrier signal, whether weak or strong. Signal bars show the estimated average signal strength in areas of Mercer Island, WA where that carrier has coverage.
If a carrier says you should have service but you do not, run a challenge test with the FCC Mobile Speed Test App. The FCC uses those results to check carrier-submitted coverage data and requires a carrier response when enough tests show a pattern of inaccurate coverage reporting.