| Sunday Lake, Washington | |
| Settlement Type: | CDP |
| Pushpin Map: | Washington |
| Pushpin Map Caption: | Location of Sunday Lake, Washington. |
| Subdivision Type: | Country |
| Subdivision Name: | United States |
| Subdivision Type1: | State |
| Subdivision Name1: | Washington |
| Subdivision Type2: | County |
| Subdivision Name2: | Snohomish |
| Area Total Sq Mi: | 1.79 |
| Area Land Sq Mi: | 1.73 |
| Area Water Sq Mi: | 0.06 |
| Area Total Km2: | 4.65 |
| Area Land Km2: | 4.48 |
| Area Water Km2: | 0.17 |
| Population As Of: | 2010 |
| Population Total: | 640 |
| Population Density Km2: | 142.8 |
| Population Density Sq Mi: | 369.9 |
| Timezone: | Pacific (PST) |
| Utc Offset: | -8 |
| Timezone Dst: | PDT |
| Utc Offset Dst: | -7 |
| Coordinates: | 48.2303°N -122.2678°W |
| Blank Name: | FIPS code |
| Blank1 Name: | GNIS feature ID |
| Blank1 Info: | 2585044[1] |
Sunday Lake is a census-designated place (CDP) in Snohomish County, Washington, United States. The population was 640 at the 2010 census.
According to the United States Census Bureau, the CDP has a total area of 1.79 square miles (4.65 km), of which, 1.73 square miles (4.48 km) is land and 0.06 square miles (0.17 km; 3.57%) is water.