Field crops · NASS annual estimates, 2025
Where is corn grown?
Iowa grows the most corn: 16% of the 17 billion bushels grown in the US in 2025.
Next come Illinois (14%) and Nebraska (12%).
- US total, 2025
- 17 billion bushelsNASS estimate
- Top state
- Iowa16% of total
- Farms reporting, 2022
- 289,382in 49 states
- Farm value, 2025
- $70.1 billionvalue of production
Source: USDA National Agricultural Statistics Service. State view: NASS annual estimates, 2025. County view: 2022 Census of Agriculture (production). Field corn harvested for grain, the corn used for feed, ethanol, corn syrup, meal and chips. Sweet corn has its own page.
Which state grows the most corn?
Iowa grows the most corn: 16% of the 17 billion bushels grown in the US in 2025. Ranked by NASS's 2025 estimate.
Which counties grow the most corn?
From the 2022 Census of Agriculture, which reports corn for 2,667 counties. NASS withholds 364 of those county figures to protect individual farms, so a withheld county could be larger than some listed here.
| County | Bushels | Share of US |
|---|---|---|
| Kossuth County, IA | 62,768,119 | under 1% |
| Iroquois County, IL | 62,513,878 | under 1% |
| McLean County, IL | 61,764,027 | under 1% |
| LaSalle County, IL | 61,427,036 | under 1% |
| Livingston County, IL | 60,712,962 | under 1% |
| Champaign County, IL | 55,604,295 | under 1% |
| Renville County, MN | 53,676,916 | under 1% |
| Bureau County, IL | 50,335,316 | under 1% |
| Sangamon County, IL | 50,228,520 | under 1% |
| Martin County, MN | 49,177,589 | under 1% |
| Redwood County, MN | 48,880,497 | under 1% |
| Pottawattamie County, IA | 48,082,473 | under 1% |
| Henry County, IL | 46,614,546 | under 1% |
| Blue Earth County, MN | 46,453,017 | under 1% |
| Buchanan County, IA | 45,458,920 | under 1% |
How has US production of corn changed?
NASS annual estimates, 2000 to 2025.
When is corn harvested?
In 2024, the US harvest of corn was 10% done by the week ending September 22, half done by October 20 and 90% done by November 3.
NASS Crop Progress, 2024, from weekly US crop progress reports. Timing varies by state and year.
Corn by the numbers
Each note is calculated from USDA NASS data; the source is listed under it.
How concentrated
The top three states, Iowa, Illinois and Nebraska, account for 42% of the corn grown in the US.
NASS annual estimates, 2025
How widespread
Farms in 49 states reported corn in the 2022 Census of Agriculture, 289,382 farms in all.
2022 Census of Agriculture
Top county
Kossuth County, Iowa has under 1% of the corn grown in the US, more than any other county.
2022 Census of Agriculture
Ten-year change
US production of corn rose 25% between 2015 and 2025, from 13.6 billion bushels to 17 billion bushels.
NASS annual estimates
Record year
2025 was the biggest year in NASS estimates going back to 2000, at 17 billion bushels.
NASS annual estimates
Long-time leader
Iowa has led NASS's state estimates for corn every year since at least 2000.
NASS annual estimates
Farm value
NASS puts the value of US corn production in 2025 at $70.1 billion.
NASS annual estimates
Census to Census
US production of corn rose 57% between the 1997 and 2022 Censuses of Agriculture, from 8.7 billion bushels to 13.7 billion bushels.
Censuses of Agriculture, 1997 to 2022
About this data
Field corn harvested for grain, the corn used for feed, ethanol, corn syrup, meal and chips. Sweet corn has its own page.
State and national figures come from NASS's annual estimates (final 2025 figures; in-season forecasts are not used). County figures and the county map come from the 2022 Census of Agriculture, the only source that covers every county. NASS withholds some figures, marked "withheld", to avoid disclosing data for individual farms.
Source: USDA National Agricultural Statistics Service, Quick Stats. Series: CORN, GRAIN - PRODUCTION, MEASURED IN BU; CORN, GRAIN - PRODUCTION, MEASURED IN BU. Data processed 2026-11-06. Methodology.