2017 Growth Rate
-0.42%
County Website
State
Founded
1841
County Seat
Monticello
Lat/Lng
Piatt County, Illinois's estimated population is 16,456 with a growth rate of -0.42% in the past year according to the most recent United States census data. Piatt County, Illinois is the 65th largest county in Illinois.
| Year | Population | Growth | Growth Rate |
| 2018 | 16,396 | -60 | -0.36% |
| 2017 | 16,456 | -70 | -0.42% |
| 2016 | 16,526 | 177 | 1.08% |
| 2015 | 16,349 | -59 | -0.36% |
| 2014 | 16,408 | -21 | -0.13% |
| 2013 | 16,429 | -71 | -0.43% |
| 2012 | 16,500 | -177 | -1.06% |
| 2011 | 16,677 | -32 | -0.19% |
| 2010 | 16,709 | 1,161 | 7.47% |
| 1990 | 15,548 | -1,033 | -6.23% |
| 1980 | 16,581 | 1,072 | 6.91% |
| 1970 | 15,509 | 549 | 3.67% |
| 1960 | 14,960 | 990 | 7.09% |
| 1950 | 13,970 | -689 | -4.70% |
| 1940 | 14,659 | -929 | -5.96% |
| 1930 | 15,588 | -126 | -0.80% |
| 1920 | 15,714 | -662 | -4.04% |
| 1910 | 16,376 | -1,330 | -7.51% |
| 1900 | 17,706 | 644 | 3.77% |
| 1890 | 17,062 | 1,479 | 9.49% |
| 1880 | 15,583 | 4,630 | 42.27% |
| 1870 | 10,953 | 4,826 | 78.77% |
| 1860 | 6,127 | 4,521 | 281.51% |
| 1850 | 1,606 | 0.00% |
| Race | Population | Percentage |
| White | 15,368 | 93.52% |
| Two or More Races | 771 | 4.69% |
| Black or African American | 175 | 1.06% |
| Asian | 64 | 0.39% |
| Some Other Race | 40 | 0.24% |
| American Indian and Alaska Native | 15 | 0.09% |
43
41.8
44.1
There are 12,709 adults, (3,022 of whom are seniors) in Piatt County, Illinois.
Female
8,311
50.58%
Male
8,122
49.42%
| Type | Count | Average Size | Owned |
| All | 6,676 | 2.45 | 81.7 |
| Married | 4,007 | 2.95 | 90.8 |
| Non Family | 1,819 | 1.14 | 70.3 |
| Female | 579 | 2.9 | 61.5 |
| Male | 271 | 2.94 | 65.3 |
| Education Attained | Count | Percentage |
| Less Than 9th Grade | 170 | 1.47% |
| 9th to 12th Grade | 451 | 3.91% |
| High School Graduate | 3,985 | 34.54% |
| Some College | 2,375 | 20.58% |
| Associates Degree | 1,271 | 11.01% |
| Bachelors Degree | 2,214 | 19.19% |
| Graduate Degree | 1,073 | 9.30% |
| Name | Total | High School | Bachelors |
| White | 10,897 | 10,364 | 3,135 |
| Multiple Races | 372 | 317 | 29 |
| Hispanic | 124 | 116 | 54 |
| Black | 89 | 73 | 9 |
| Asian | 33 | 24 | 20 |
| Other Race | 31 | 31 | 31 |
| Native American | 15 | 15 | 15 |
The highest rate of high school graduation is among native american people with a rate of 100.00%.
The highest rate of bachelors degrees is among native american people with a rate of 100.00%.
$39,920
Average Earnings
$47,166
Average Male
$32,659
Average Female
97.76% of Piatt County, Illinois residents speak only English, while 2.24% speak other languages. The non-English language spoken by the largest group is Other Indo-European, which is spoken by 1.07% of the population.
| Name | Total | In Poverty | Poverty Rate |
| White | 15,176 | 776 | 5.11% |
| Multiple | 764 | 51 | 6.68% |
| Asian | 64 | 50 | 78.13% |
| Black | 143 | 11 | 7.69% |
| Hispanic | 209 | 8 | 3.83% |
5.44%
Overall Poverty Rate
4.92%
Male Poverty Rate
5.94%
Female Poverty Rate
The race most likely to be in poverty in Piatt County, Illinois is Asian, with 78.13% below the poverty level.
The race least likely to be in poverty in Piatt County, Illinois is Hispanic, with 3.83% below the poverty level.
The poverty rate among those that worked full-time for the past 12 months was 1.30%. Among those working part-time, it was 6.66%, and for those that did not work, the poverty rate was 8.72%.
61.2%
Overall Marriage Rate
62.6%
Male Marriage Rate
59.8%
Female Marriage Rate
The age group where males are most likely to be married is 55-64, while the female age group most likely to be married is 45-54.
| Name | Veterans | % of Total |
| White | 1,247 | 10.32% |
| 2 or More | 71 | 15.88% |
| Hispanic | 2 | 1.53% |
4.12%
Veteran Poverty Rate
29.01%
Veteran Disability Rate
68.8%
Labor Force Participation
65.6%
Employment Rate
4.5%
Unemployment Rate
Non citizens include legal permanent residents (green card holders), international students, temporary workers, humanitarian migrants, and illegal immigrants.
98.83%
Native Born
1.17%
Foreign Born
0.67%
Non Citizen
98.83% of Piatt County, Illinois residents were born in the United States, with 83.19% having been born in Illinois. 0.67% of residents are not US citizens. Of those not born in the United States, the largest percentage are from Europe.
| City | 2010 Census | 2016 Estimated | Growth | Growth Rate |
| Monticello | 5548 | 5585 | 37 | 0.67% |
| Bement | 1730 | 1696 | -34 | -1.97% |
| Cerro Gordo | 1403 | 1363 | -40 | -2.85% |
| Atwood | 1222 | 1185 | -37 | -3.03% |
| Mansfield | 906 | 876 | -30 | -3.31% |
| Hammond | 509 | 488 | -21 | -4.13% |
| De Land | 446 | 428 | -18 | -4.04% |
| Ivesdale | 267 | 265 | -2 | -0.75% |
| Cisco | 261 | 257 | -4 | -1.53% |