Birnamwood, Wisconsin Demographics & Population 2026

A note before these figures: with a population of 643, Birnamwood's ACS estimates come from a small number of survey responses and carry wide margins of error. Individual percentages below — particularly rates that round to 0% or 100% — are approximations, not precise measurements. See data.census.gov for the published margins of error.

Population Overview

Birnamwood is a small community located in Wisconsin, within Marathon County. The total population is 643. It ranks as the 481st most populous out of 808 Census-designated places in Wisconsin.

Age Demographics

The median age in Birnamwood is 50.2 years. This is 25% higher than the state median of 40.2 years. 10.4% of residents are 75 or older, suggesting a significant retirement-age population with implications for healthcare services and senior housing.

Economy, Income & Housing

The median household income in Birnamwood is $63,750. This is 18% lower than the state median of $77,485. It is also 21% lower than the national median of $80,734. The poverty rate stands at 11.4%. This is 8% higher than the state poverty rate of 10.5%. The unemployment rate is 2.7%. This is 17% lower than the state rate of 3.3%. The median home value is $143,400. Housing costs are 46% lower than the state median of $266,500. With a home-value-to-income ratio of just 2.2x, Birnamwood is one of the most affordable housing markets in the area. 62.9% of occupied housing units are owner-occupied. This homeownership rate is 7% lower than the state average of 67.8%.

Race & Ethnicity

Birnamwood has a predominantly White (non-Hispanic) population, comprising 90.7% of all residents. Hispanic or Latino residents account for 4.2%. The Asian population (1.1%) is well below the state average of 2.9%.

Education

10.1% of residents aged 25 and older hold a bachelor's degree or higher. This is 70% lower than the state rate of 33.4%. Nationally, 35.7% of adults hold at least a bachelor's degree. The high school graduation rate (or equivalent) is 95.8%.

Data Sources & Methodology

All demographic data for Birnamwood, Wisconsin is sourced from the U.S. Census Bureau's American Community Survey (ACS) 2020–2024 5-Year Estimates. The ACS collects data from approximately 3.5 million households annually and pools five years of responses so that even small communities can be measured, though the margin of error widens as the population falls. Comparisons are made against Wisconsin state averages and national averages calculated from the same dataset. Rankings reflect the city's position among all 808 Census-designated places in Wisconsin. Read more about how these figures are produced on our methodology page, or visit data.census.gov for official data.