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Hamilton, Washington
Brick Building in Hamilton WA.jpg
Location of Hamilton, Washington
Location of Hamilton, Washington
Country United States
State Washington
County Skagit
 • Total 1.20 sq mi (3.10 km2)
 • Land 1.20 sq mi (3.10 km2)
 • Water 0.00 sq mi (0.00 km2)
95 ft (29 m)
 • Total 301
 • Estimate 
 • Density 258.98/sq mi (100.01/km2)
Time zone UTC-8 (Pacific (PST))
 • Summer (DST) UTC-7 (PDT)
ZIP code
Area code 360
FIPS code 53-29255
GNIS feature ID 1520479

Hamilton is a town in Skagit County, Washington, United States. The population was 301 at the 2010 census. It is included in the Mount Vernon-Anacortes, Washington Metropolitan Statistical Area.


Hamilton was first settled in 1877 by William Hamilton, and was later named for him when Hamilton was officially incorporated on March 19, 1891.


Hamilton is located at 48°31′34″N 121°59′20″W / 48.52611°N 121.98889°W / 48.52611; -121.98889 (48.526005, -121.988958).

According to the United States Census Bureau, the town has a total area of 1.13 square miles (2.93 km2), all of it land.


The climate in this area has mild differences between highs and lows, and there is adequate rainfall year-round. According to the Köppen Climate Classification system, Hamilton has a marine west coast climate, abbreviated "Cfb" on climate maps.


Historical population
Census Pop.
1890 203
1900 392 93.1%
1910 405 3.3%
1920 462 14.1%
1930 252 −45.5%
1940 229 −9.1%
1950 294 28.4%
1960 271 −7.8%
1970 196 −27.7%
1980 268 36.7%
1990 228 −14.9%
2000 309 35.5%
2010 301 −2.6%
2019 (est.) 310 3.0%
U.S. Decennial Census
2015 Estimate

2010 census

As of the census of 2010, there were 301 people, 116 households, and 80 families living in the town. The population density was 266.4 inhabitants per square mile (102.9/km2). There were 141 housing units at an average density of 124.8 per square mile (48.2/km2). The racial makeup of the town was 90.4% White, 2.0% Native American, 3.7% from other races, and 4.0% from two or more races. Hispanic or Latino of any race were 4.3% of the population.

There were 116 households, of which 31.9% had children under the age of 18 living with them, 51.7% were married couples living together, 9.5% had a female householder with no husband present, 7.8% had a male householder with no wife present, and 31.0% were non-families. 19.0% of all households were made up of individuals, and 1.7% had someone living alone who was 65 years of age or older. The average household size was 2.59 and the average family size was 2.99.

The median age in the town was 40.5 years. 23.9% of residents were under the age of 18; 9.6% were between the ages of 18 and 24; 25.9% were from 25 to 44; 30.5% were from 45 to 64; and 10% were 65 years of age or older. The gender makeup of the town was 48.5% male and 51.5% female.


As part of the Skagit River floodway, the town of Hamilton faces significant flooding every few years. The flooding is so frequent that many residents have a routine: Move the furniture to the second floor of their home and then move to a local church until the flood subsides. The Federal Emergency Management Agency (FEMA) estimates it has spent $10 million in the town over the last several years.

Support has been building for a plan to move the entire town to a nearby hill. The Hamilton Public Development Authority was established in 2004 to purchase the land necessary for moving the town.

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