Town in DeKalb County, Illinois · 3.6 sq mi · 1,313 people per sq mi
About 4,700 people live in Cortland. The typical household earns $73,971, and the median resident is 31.5 years old.
2026 projection
From 4,396 in 2020
Poverty rate 7.01%
Men 27.8 · Women 37.2
1880–2026
4,718
2026 projection
7.3% since 2020 (increase)
Source: U.S. Census Bureau decennial counts and annual estimates. 2026 is a projection. Values between recorded years are interpolated.
Use the left and right arrow keys to inspect population observations.
1880–2026
4,718
2026 projection
7.3% since 2020 (increase)
Source: U.S. Census Bureau decennial counts and annual estimates. 2026 is a projection. Values between recorded years are interpolated.
Use the left and right arrow keys to inspect population observations.
| 2026 | 4,718 | +42 | 0.90% |
|---|---|---|---|
| 2025 | 4,676 | +111 | 2.43% |
| 2024 | 4,565 | +81 | 1.81% |
| 2023 | 4,484 | +40 | 0.90% |
| 2022 | 4,444 | +33 | 0.75% |
| 2021 | 4,411 | +15 | 0.34% |
| 2020 | 4,396 | -22 | 0.50% |
| 2019 | 4,418 | +36 | 0.82% |
| 2018 | 4,382 | +40 | 0.92% |
| 2017 | 4,342 | +8 | 0.18% |
Showing 10 of 30 years.
U.S. Census Bureau, 2024 ACS 5-year estimates · Table S0101
Each square is about 1% of residents (roughly 46 people).
Hispanic or Latino residents can be of any race. All other groups exclude Hispanic residents.
U.S. Census Bureau, 2024 ACS 5-year estimates · Table B03002
Half of households earn more, half earn less
Typical yearly pay for a worker 25 or older.
About 1 in 14 residents
47% of residents age 15 and older are married.
| Status | Overall | Male | Female |
|---|---|---|---|
| Married | 47% | 45% | 49% |
| Never married | 36% | 44% | 26% |
| Divorced | 15% | 10% | 20% |
| Widowed | 1% | 0% | 3% |
| Separated | 1% | 1% | 1% |
U.S. Census Bureau, 2024 ACS 5-year estimates · Table S1201
10 sources, all from the U.S. Census Bureau