Pompeys Pillar, Montana Demographics & Population 2026

A note before these figures: with a population of 27, Pompeys Pillar'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

Pompeys Pillar is a small community located in Montana, within Yellowstone County. The total population is 27. It ranks as the 425th most populous out of 475 Census-designated places in Montana.

Age Demographics

The median age in Pompeys Pillar is 51.9 years. This is 28% higher than the state median of 40.4 years. With 29.6% of the population under 18, Pompeys Pillar has a notably young demographic profile, suggesting a family-oriented community.

Economy, Income & Housing

The ACS records no residents below the poverty line in Pompeys Pillar. In a community this small the estimate rests on very few survey responses, so it should be read as an absence of measurement rather than a measured absence of poverty. 31.6% of occupied housing units are owner-occupied. This homeownership rate is 54% lower than the state average of 69.2%.

Race & Ethnicity

Every resident counted in Pompeys Pillar was recorded as White (non-Hispanic). A figure of exactly 100.0% reflects a survey sample too small to capture the community's full composition rather than a precise measurement.

Education

0.0% of residents aged 25 and older hold a bachelor's degree or higher. This is among the lowest rates in the state, which may correlate with employment and income patterns. Nationally, 35.7% of adults hold at least a bachelor's degree. No surveyed resident aged 25 or older reported leaving school before earning a high school diploma, though a rate of exactly 100% reflects the limits of a small sample.

Data Sources & Methodology

All demographic data for Pompeys Pillar, Montana 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 Montana state averages and national averages calculated from the same dataset. Rankings reflect the city's position among all 475 Census-designated places in Montana. Read more about how these figures are produced on our methodology page, or visit data.census.gov for official data.