Mercer Island, WA: Population, ZIP Codes & Nearby Cities

Mercer Island is a small incorporated city in King County, Washington. In the dataset behind this page it has an estimated population of 25,894, sits at 47.566°N, 122.232°W, and observes Pacific time. Below you will find how it ranks inside Washington, which ZIP codes it uses, the closest places around it, and how far it is from major US cities.

What are the key facts about Mercer Island, WA?

What is the population of Mercer Island, WA?

Mercer Island has an estimated population of 25,894. That makes it the 51st largest of the 609 places we list in Washington, and the 18th largest of 61 places in King County. The typical place in Washington has about 2,224 residents, so Mercer Island is roughly 11.6 times the size of a typical neighbor in the state.

Estimates for places of this size carry wider margins of error than those for big cities, so treat the figure as a guide to scale. Our guide to understanding city population numbers explains why sources disagree.

Places in Washington with a similar population include Maple Valley (27,202), Snoqualmie (26,289), Bainbridge Island (25,298), Camas (24,418), Ellensburg (24,377). Comparing these pages is a quick way to see how Mercer Island differs from communities of the same scale.

How dense is Mercer Island?

Mercer Island has about 4,056 people per square mile (1,566 per square kilometer), which we classify as suburban. Within Washington, it is denser than about 93% of the listed places. Land at this level is usually a mix of single-family neighborhoods, shopping corridors and parks, where driving is common but destinations are close. Read how to interpret population density to see how we draw these lines.

What ZIP codes does Mercer Island use?

Mercer Island uses one ZIP code: 98040. A single code usually means a compact delivery area, but the same code may also serve addresses just outside the town line. Codes beginning with 9 are assigned to the Pacific states (Alaska, California, Hawaii, Oregon and Washington). Learn more in our guide to how ZIP codes work or check any code with the ZIP code lookup.

What time zone is Mercer Island in?

Mercer Island is in the Pacific time zone, which is UTC−8 from Coordinated Universal Time in standard time (IANA zone America/Los_Angeles). The area observes daylight saving time, so clocks move forward in March and back in November. The nearest listed place in a different time zone is Weiser, ID, about 341 miles away, which gives a sense of how far the nearest zone boundary may be. Current local time: see the Pacific time hub. For the rules behind these zones, read US time zones explained.

Where is Mercer Island located in Washington?

Mercer Island lies in the western part of Washington, at 47.566° north latitude and 122.232° west longitude. The state capital, Olympia, is about 48 miles to the southwest. The closest listed place in another state is Astoria, OR, roughly 121 miles to the southwest, which shows how near Mercer Island is to a state line. For big-city services, the nearest place with more than 100,000 people is Bellevue, WA, 4 miles to the northeast.

Which cities are near Mercer Island, WA?

The closest listed place to Mercer Island is Newcastle, WA, 4.0 miles to the southeast. Of the eight nearest places below, 8 are in the same county. Distances are straight-line (great-circle) miles measured between place centers; see how distance is calculated.

Which county is Mercer Island in?

Mercer Island is in King County, which has the Federal Information Processing Standards (FIPS) code 53033. The county contains 61 places in our data, 40 of which have their own page here and 21 smaller communities that appear only in county and state lists. Other places in the county include Seattle (3,789,215), Bellevue (148,164), Kent (132,319), Renton (101,751), Federal Way (96,289). Codes like this one help separate places that share a name; see the guide to counties and FIPS codes.

How far is Mercer Island from major US cities?

Among six major hubs, Mercer Island is closest to Los Angeles, CA at about 950 miles and farthest from New York, NY at about 2,402 miles in a straight line. Road distances are usually 10 to 30 percent longer. Try the distance calculator for any other pair.

Are there other places called Mercer Island?

No. In our data, Mercer Island in King County, Washington is the only place with this name, so the name alone is enough to identify it, though adding the state is still good practice in addresses and forms.

Where to go next

Population and density come from a compiled dataset and are estimates. They may differ from official Census Bureau counts. Verify important figures at census.gov.