Demographics & People — Monticello, Iowa
Population Overview
| Population (Census) | 4,055 |
| Estimated 2026 | ~4,100 |
| Median Age | 42.6 |
| Total Households | 1,788 |
| Family Households | 909 |
| Average Household Size | 2.19 |
| Diversity Index | 0.1185 (relatively homogeneous) |
Race & Ethnicity
| White | 3,690 |
| Black or African American | 66 |
| Asian | 35 |
| Hispanic or Latino | 143 |
Heritage & Ancestry
| Group | Count |
| German | 1,728 |
| Irish | 776 |
| Unclassified or not reported | 770 |
| Other groups | 544 |
| English | 477 |
| American | 317 |
| Hispanic: Hispanic or Latino | 234 |
| Hispanic: Mexican | 210 |
| European | 110 |
| African | 85 |
Language
| English Only | 3,628 |
| Spanish | 128 |
| Population 5+ | 3,791 |
Veterans
| Veterans | 242 |
| Population 18+ | 3,137 |
Source: Census ACS 5-Year 2023; Census ACS 5-Year 2023, Table B01003; Census ACS 5-Year 2023, B19013. Data for Monticello, Iowa.