Is Watertown growing?

How much Watertown, SD has grown or shrunk since 2015, how that compares with the county, the state and the United States, and how the community's age is changing.

U.S. Census Bureau, American Community Survey 5-year estimates.

This story was assembled using AI and public data sources.

Watertown looks different than it did in 2015.

Population change since 2015: +4.3% — 21,919 residents in 2015 → 22,859 in 2023

Watertown population, 2015 to 2023

2015: 21919
2023: 22859

Growth since 2015

Watertown: 4.3
Codington County: 2.9
SD: 6.6
U.S.: 5

Median age: 39.4 — U.S. median: 38.7

What it means

Watertown is growing at roughly the national pace since 2015.

These are estimates, not a head count. ACS 5-year figures average responses collected over five years, so they show direction and scale rather than a single day's population.

Sources

U.S. Census Bureau — American Community Survey (ACS) 5-year estimates — Population, income, housing, education, commuting and poverty figures
Census Bureau API — ACS Detailed Tables — The endpoint these pages are generated from
data.census.gov — Look up the same tables for any place yourself
ACS accuracy statement — Estimates carry margins of error; small places vary the most

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