Diamond, Missouri Demographics & Population 2026

A note before these figures: with a population of 914, Diamond'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

Diamond is a small community located in Missouri, within Newton County. The total population is 914. It ranks as the 391st most populous out of 1,062 Census-designated places in Missouri.

Age Demographics

The median age in Diamond is 37.3 years. This is 4% lower than the state median of 39.0 years.

Economy, Income & Housing

The median household income in Diamond is $73,587. This is 4% higher than the state median of $70,702. It is also 9% lower than the national median of $80,734. The poverty rate stands at 3.7%. This is 70% lower than the state poverty rate of 12.6%. This exceptionally low poverty rate indicates strong economic prosperity across the community. The unemployment rate is 6.6%. This is 65% higher than the state rate of 4.0%. The median home value is $141,400. Housing costs are 39% lower than the state median of $230,300. With a home-value-to-income ratio of just 1.9x, Diamond is one of the most affordable housing markets in the area. 78.3% of occupied housing units are owner-occupied. This homeownership rate is 15% higher than the state average of 68.1%.

Race & Ethnicity

The largest racial or ethnic group in Diamond is White (non-Hispanic), making up 82.4% of the population. Hispanic or Latino residents account for 9.4%. The Black or African American population (1.3%) is well below the state average of 10.9%. The Hispanic or Latino population is significantly higher than the state average (9.4% vs 5.2%).

Education

17.9% of residents aged 25 and older hold a bachelor's degree or higher. This is 45% lower than the state rate of 32.4%. Nationally, 35.7% of adults hold at least a bachelor's degree. The high school graduation rate (or equivalent) is 87.1%.

Data Sources & Methodology

All demographic data for Diamond, Missouri 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 Missouri state averages and national averages calculated from the same dataset. Rankings reflect the city's position among all 1,062 Census-designated places in Missouri. Read more about how these figures are produced on our methodology page, or visit data.census.gov for official data.