Boone County area

Population and density of Boone County

The Census Bureau estimates that 191,746 people lived in Boone County on July 1, 2025. That ranks #372 of 3,222 county equivalents nationally and #8 of 115 in Missouri. Since the April 1, 2020 estimates base of 183,614, the population has grown by 8,132 (+4.4%), compared with +1.9% for Missouri as a whole.

With 685.6 square miles of land, that is 280 people per square mile (108 per km²), placing Boone County #535 nationally for density and #8 in Missouri. The median county equivalent has 47 people per square mile; the Missouri median is 31. Put another way, there are about 2.3 acres of land per resident.

U.S. Census Bureau, Vintage 2025 population estimates. Estimates are revised each year and are not decennial census counts. Density divides the whole population by the whole county’s land area, so it describes an average, not how settlement is distributed within the county. Population sources and methods.

Cities and towns in Boone County

12 incorporated places lie at least partly in Boone County. Together they are home to 144,289 people (75.3%); the other 47,457 (24.7%) live outside any incorporated place, in unincorporated communities and rural areas.

The largest is Columbia city, with 130,851 residents in the county. Among places with at least 1,000 residents in 2020, Ashland city grew fastest since then (+9.7%).

Population: U.S. Census Bureau Vintage 2025 subcounty estimates, counting only the part of each place inside Boone County. Land: 2026 Census Gazetteer, for the whole place even where it extends into other counties. How communities are listed.

Metropolitan area

Boone County is a central county of the Columbia, MO Metropolitan Statistical Area. Its 3 county equivalents have 219,062 residents on 1,714.1 square miles of land; Boone County accounts for 40% of the land and 87.5% of the residents. By combined land it ranks #186 of 393 metropolitan areas, and #222 by population. It belongs to the Columbia-Jefferson City-Moberly, MO Combined Statistical Area.

ZIP codes

13 ZIP Code Tabulation Areas have land in Boone County; 11 of them have most of their land inside the county, and the others mainly cover neighboring areas.

65010650396520165202652036521565216652406524365255652566527965284

ZIP Code Tabulation Areas are the Census Bureau’s approximations of USPS ZIP Code service areas, from the 2020 Census relationship files. Lighter codes have less than half of their land in this county. Post-office-box and single-address ZIP Codes have no tabulation area.

Counties bordering Boone County

Boone County shares a land border with 7 county equivalents. It has more land than 5 of them. The largest neighbor is Callaway County (834.6 mi²) and the smallest is Cole County (391.6 mi²). Together with its neighbors, Boone County forms a block of 4,530.3 mi² of land, of which it holds 15.1%.

How big is Boone County compared with U.S. states?

Boone County has less land than any of the 50 states. Rhode Island, the smallest state by land area, has 1,033.9 mi², about 1.5 times as much. Missouri’s county land could hold about 100 areas the size of Boone County.

Another way to picture it: the same land area would fill a square about 26.2 miles (42.1 km) on each side. Real county shapes are rarely square, so this is a scale reference rather than a width or driving distance.

State figures are the sums of each state’s county-equivalent land measurements in the same Census release, so states and counties are compared on the same basis. Published state totals can differ slightly because of rounding. Compare all states · Counties bigger than entire states.

What stands out about Boone County?

Boone County has more land than 1,854 of the other 3,221 county equivalents in the dataset.

A median is the middle county-equivalent measurement, not the average of the largest and smallest. All three bars use the same linear scale. Very small areas may appear as a thin sliver; the labels retain their values.

Does including water change its rank?

Using land plus water places Boone County at #1,463 nationally by total area, 95 places farther from the top than its land rank. Other county equivalents gain more area when their water measurements are included.

Its water share is 0.8%, compared with a national county-equivalent median of 1.2% — 0.4 percentage points lower. This describes the statistical geography’s land/water mix, not flood exposure or developable land.

Closest positions in the national land ranking

These entries sit immediately beside Boone County in the national ranking. They can be in different states and are not necessarily geographic neighbors.

Calculated from the same Census release as the area table. Total-area order uses original ALAND + AWATER; water shares and chart labels use published square miles. Calculation details.