Watertown, South Dakota

Watertown population, 2020 to 2024

Watertown added 809 residents from July 2020 to July 2024, a change of +3.6%. In the latest year it moved by +283. Among 18 South Dakota places of 5,000 or more, that growth ranks 9th; the median place changed by +2.7%. The median place of 5,000+ in South Dakota has 13,845 people, so Watertown is 1.7 times that size.

Watertown covers 18.44 square miles of land and 7.98 of water, for 1,274 people per square mile of land. The median South Dakota place of 5,000+ has 1,459, so Watertown is less dense than the typical town.

What county Watertown is in

All of Watertown's residents live in Codington County, which had 29,278 residents in 2024. Watertown holds 80.2% of the county's population. The shaded shape is on the map above; dots mark the eight nearest places.

ZIP codes in Watertown

1 ZIP Code Tabulation Area (ZCTA) overlaps Watertown by at least 10% of the ZCTA's or the city's land: 57201. ZCTAs are Census approximations of USPS ZIP code delivery areas. The list comes from the 2020 ZCTA to place relationship file, so a city that annexed land after 2020 may reach into ZIP codes not listed here.

Where Watertown is

The Census internal point of Watertown is at 44.909200, -97.155700. Pierre, the capital, is 161.2 miles WSW in a straight line. The nearest larger place is Brookings, SD (24,555 people), 45.6 miles away. The nearest city of 100,000 or more is Sioux Falls, SD, 96.9 miles away.

Daylight in Watertown

At 44.91° N, Watertown gets about 15 h 36 min of daylight around the June solstice and 8 h 47 min around the December solstice, a swing of 6 h 50 min. Figures are sunrise to sunset from the SunCalc model for June 21 and December 21, 2026.

Places near Watertown

The eight nearest incorporated places of 1,000+ in South Dakota, measured between internal points. The closest is Clear Lake, 25.1 miles away, with 1,201 people.