Major highways

• U.S. Highway 30 – runs ENE across bottom of county. Enters at Dunlap, exits to Carroll County at Westside.
• U.S. Highway 59 – runs generally north–south through center of county, passing Schleswig and Denison. Its exit into Shelby County is five miles east of its entry from Ida County.
• Iowa Highway 37 – cuts the SW corner of county, running SE from Monona County to Harrison County.
• Iowa Highway 39 – runs north and ENE from Denison to Kiron, then into Ida and Sac Counties.
• Iowa Highway 141 – enters SE part of county at Aspinwall, runs west to intersection with US Highway 59, two miles above the county's south line.^[6]

Adjacent counties

• Ida County − north
• Sac County − northeast
• Carroll County − east
• Audubon County − southeast
• Shelby County − south
• Harrison County − southwest
• Monona County − west
• Woodbury County − northwest

2020 census

The 2020 census recorded a population of 16,525 in the county, with a population density of 23.1349/sq mi (8.93244/km²). 89.34% of the population reported being of one race. There were 6,855 housing units of which 6,255 were occupied.^[1]

2010 census

The 2010 census recorded a population of 17,096 in the county, with a population density of 23.944/sq mi (9.245/km²). There were 6,943 housing units, of which 6,413 were occupied.^[14]

2000 census

As of the census^[15] of 2000, there were 16,942 people, 6,441 households, and 4,489 families residing in the county. The population density was 24 people per square mile (9.3 people/km²). There were 6,958 housing units at an average density of 10 units per square mile (3.9 units/km²). The racial makeup of the county was 93.10% White, 0.76% Black or African American, 0.28% Native American, 0.49% Asian, 0.01% Pacific Islander, 4.59% from other races, and 0.77% from two or more races. 8.75% of the population were Hispanic or Latino of any race.

There were 6,441 households, out of which 31.60% had children under the age of 18 living with them, 58.50% were married couples living together, 7.00% had a female householder with no husband present, and 30.30% were non-families. 26.20% of all households were made up of individuals, and 13.10% had someone living alone who was 65 years of age or older. The average household size was 2.53 and the average family size was 3.03.

In the county, the population was spread out, with 26.50% under the age of 18, 8.10% from 18 to 24, 25.70% from 25 to 44, 22.50% from 45 to 64, and 17.10% who were 65 years of age or older. The median age was 38 years. For every 100 females there were 100.90 males. For every 100 females age 18 and over, there were 98.80 males.

The median income for a household in the county was $33,922, and the median income for a family was $40,231. Males had a median income of $28,696 versus $19,798 for females. The per capita income for the county was $15,851. About 6.90% of families and 11.10% of the population were below the poverty line, including 12.70% of those under age 18 and 5.60% of those age 65 or over.

Cities

Former cities

Townships

Population ranking

The population ranking of the following table is based on the 2020 census of Crawford County.^[1]

† county seat