Interactive map
Interactive map for U.S. Corn Production by County. Use the map controls to pan and zoom.
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U.S. Corn Production by County
Geography: United States counties
Dataset last updated:
U.S. Corn Production by County
This interactive map presents annual county-level corn estimates published by the U.S. Department of Agriculture National Agricultural Statistics Service (USDA NASS). Coverage begins in 1910 and extends through 2025.
Data were obtained from the USDA NASS Quick Stats database under the Survey program. These are annual agricultural survey estimates rather than the five-year Census of Agriculture dataset.
Available measures
- Planted Area - acres planted, available from 1924 onward.
- Grain Harvested Area - acres harvested for grain.
- Grain Production - total grain production in bushels.
- Grain Yield - bushels of grain produced per harvested acre.
- Silage Harvested Area - acres harvested for silage, available from 1926 onward.
- Silage Production - total silage production in tons.
- Silage Yield - tons of silage produced per harvested acre.
Grain and silage measures are presented separately and should not be combined into one total-corn series.
Geographic coverage
The map covers United States counties, but data are displayed only where USDA NASS published an estimate for the selected year and measure. An unshaded county generally indicates that no value was published; it should not automatically be interpreted as zero.
Interpreting the map
- Counties view colors current county polygons using published values.
- Surface view interpolates county values to illustrate broad regional patterns; it is not a measured value between reporting counties.
- Survey methods, reporting coverage, and publication practices may change across this long historical series.
- Historical records may use counties or boundaries that no longer match contemporary geography.
Data source and preparation
Source data were downloaded from the USDA NASS Quick Stats database and restructured for CU-CAT Maps. County identifiers were standardized using FIPS codes. Missing values remain blank and were not replaced with zeros.
Platform and data responsibility
CU-CAT Maps is developed and hosted by the Clemson University Center for Agricultural Technology (CU-CAT), in partnership with Clemson Cooperative Extension Service.
CU-CAT provides the mapping platform. The hosted dataset and dataset-specific content presented on this page are maintained by Kendall Kirk. CU-CAT's role in creating, verifying, or maintaining hosted data varies by page. For questions about the data presented here, contact Kendall Kirk.
CU-CAT Maps and its maps, reports, and results are provided as-is for informational purposes. Accuracy and completeness are not guaranteed. Users are responsible for evaluating the source data and outputs and assume the risks arising from their use. See the Terms of Use.
Have feedback about CU-CAT Maps, want to discuss whether a dataset may be a good fit for the platform, or have a dataset or topic you would like to see mapped? Email CU-CAT. Hosting and support depend on alignment with CU-CAT's mission, project scope, and available capacity.
© 2025-2026 Clemson University Center for Agricultural Technology (CU-CAT) and Clemson Cooperative Extension Service
Use the controls above the map to choose what to display, how to display it, and what to save or report.
Start with the data
- Choose a dataset. Most pages open with a hosted dataset. Pages with an Upload data control also let you select an Excel or CSV file for your current browser session.
- Choose a sheet. The Sheet selector appears when the dataset contains more than one available worksheet.
- Choose a variable. The Variable selector lists the columns that can be mapped. Changing the variable updates the map, legend, popups, and reports.
Choose a map view
Regions
Regions colors each mapped area according to its value or category. Use it for exact regional comparisons, popups, labels, and reporting.
Surface
Surface estimates a continuous pattern from values associated with the mapped regions. Use it to explore broad spatial trends rather than to infer exact values between regions.
Start simply: choose the view and variable first. Open Advanced only when you need to adjust classification, colors, opacity, interpolation, or other display settings.
Explore the map
- Pan and zoom as you would on a standard online map.
- In Regions view, select a region to inspect its popup. The popup may also offer a report for that region.
- In Surface view, turn on points when you need to see the observations used to create the surface.
- Use the legend to interpret colors, ranges, units, totals, averages, and areas without data.
Reports and exports
- Attribute report: compares regions for the selected variable. Sort a report table before exporting when order matters.
- Region report: available from a region popup in Regions view and compares variables for that region.
- Copy map: copies the map image when the browser supports image copying.
- Download map: saves the map as a PNG image.
- Share: shares or copies the page link. It does not currently preserve the selected map settings.
Exported map images include the data layers and legend but omit third-party basemap tiles.
Interpret with care
- Check the units and source information supplied in the About tab.
- Do not assume a missing value means zero unless the dataset supports that interpretation.
- Surface maps are generalized visualizations. Classification, smoothing, clipping, and interpolation settings can change their appearance.
- When duplicate rows are present, averaging and summing answer different questions. Use the method appropriate for the data.