Clayton County, Iowa
According to 2000 Census Bureau, there were 18678 people, 7375 households, and 5134 families living in the county. The population density was 24 people per square mile (9.27/kmē), making it the 63rd most densely populated county in Iowa. There were 8619 housing units at an average density of 11.1 per square mile (4.29/kmē). The average household size was 2.47 people, and the average family size was 2.98 people. In the county the population was spread out, with 25.4% under the age of 18, 6.5% from 18 to 24, 26% from 25 to 44, 23.6% from 45 to 64, and 18.5% who were 65 or older. For every 100 males there were 102.5 females. For every 100 males age 18 and over, there were 104.7 females. According to July 2008 Census Bureau estimates, the population of the county is 17566, The racial or ethnic makeup of the county was 98.74% White, 0.21% Black or African American, 0.27% American Indian, 0.23% Asian, 0.01% Native Hawaiian, and 0.54% from two or more races.
The median income for a household in the county was $34068, making it the 27th poorest county by median household income among the Iowa. The median income for a family in the county was $40199, making its Iowa's 13th lowest county by median family income. The per capita income for the county was $16930, making it the 26th poorest county by per capita income among the Iowa.
In 2000, 4406 pupils and students, of which 48.34% are male and 51.66% are female, 23.59% of the total population, are in the education system. Of which, percentage of enrollment student are in, 4.81% nursery or pri school, 5.36% kindergarten, 51.93% elementary school, 29.23% high school and 8.67% College graduate school.
| Rank | City | County | Total Area mi2 | Land Area mi2 | Water Area mi2 | Population | Density mi2 | Per capita Income | House hold Income |
|---|---|---|---|---|---|---|---|---|---|
| 1 | Postville City | Allamakee County, Clayton County | 2.08 | 2.08 | 0 | 2273 | 1093.6 | 14264 | 32667 |
| 2 | Clayton City | Clayton County | 0.55 | 0.55 | 0 | 55 | 99.8 | 21214 | 31250 |
| 3 | Elkader City | Clayton County | 1.4 | 1.4 | 0 | 1465 | 1049 | 16785 | 32857 |
| 4 | Elkport City | Clayton County | 0.19 | 0.19 | 0 | 88 | 470.2 | 11518 | 24375 |
| 5 | Farmersburg City | Clayton County | 0.4 | 0.4 | 0 | 300 | 745.9 | 14796 | 34000 |
| 6 | Garber City | Clayton County | 0.24 | 0.24 | 0 | 103 | 434.9 | 11618 | 22708 |
| 7 | Garnavillo City | Clayton County | 0.88 | 0.88 | 0 | 754 | 858.3 | 20964 | 35694 |
| 8 | Guttenberg City | Clayton County | 2.09 | 2.06 | 0.03 | 1987 | 962.3 | 17098 | 29151 |
| 9 | Littleport City | Clayton County | 0.33 | 0.33 | 0 | 26 | 78 | 16237 | 23125 |
| 10 | Luana City | Clayton County | 1.05 | 1.05 | 0 | 249 | 237.1 | 16165 | 29583 |
| 11 | Marquette City | Clayton County | 1.28 | 1.22 | 0.06 | 421 | 345.2 | 18037 | 30179 |
| 12 | Mcgregor City | Clayton County | 1.31 | 1.31 | 0 | 871 | 665.8 | 15636 | 30163 |
| 13 | Millville City | Clayton County | 0.07 | 0.07 | 0 | 23 | 342.6 | 14378 | 29583 |
| 14 | Monona City | Clayton County | 1.15 | 1.15 | 0 | 1550 | 1344.6 | 18746 | 35000 |
| 15 | North Buena Vista City | Clayton County | 0.74 | 0.69 | 0.04 | 124 | 178.4 | 12729 | 20625 |
| 16 | Osterdock City | Clayton County | 0.45 | 0.45 | 0 | 50 | 109.9 | 18566 | 31250 |
| 17 | St. Olaf City | Clayton County | 0.25 | 0.25 | 0 | 136 | 550.8 | 15284 | 34583 |
| 18 | Strawberry Point City | Clayton County | 2.05 | 2.05 | 0 | 1386 | 677.7 | 18400 | 34766 |
| 19 | Volga City | Clayton County | 0.79 | 0.79 | 0 | 247 | 314 | 13440 | 24375 |
| 20 | Edgewood City | Delaware County, Clayton County | 0.84 | 0.84 | 0 | 923 | 1092.6 | 16187 | 35455 |
| Year | Population |
|---|---|
| April 2000 census | 18678 |
| April 2000 Estimate | 18678 |
| July 2000 Estimate | 18607 |
| July 2001 Estimate | 18454 |
| July 2002 Estimate | 18218 |
| July 2003 Estimate | 18119 |
| July 2004 Estimate | 18043 |
| July 2005 Estimate | 17876 |
| July 2006 Estimate | 17775 |
| July 2007 Estimate | 17672 |
| July 2008 Estimate | 17566 |
| School | Male | Female | Total |
|---|---|---|---|
| Nursery school | 86 | 126 | 212 |
| Kindergarten | 118 | 118 | 236 |
| Elementary school | 1150 | 1138 | 2288 |
| High school | 676 | 612 | 1288 |
| College or graduate school | 100 | 282 | 382 |
| Place | Median household income | Median family income | Per capita income |
|---|---|---|---|
| Clayton County, Iowa | $34068 | $40199 | $16930 |
| Iowa, United States | $39469 | $48005 | $19674 |
| United States | $41994 | $50046 | $21587 |