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AcreValue provides reports on the value of agricultural land in Warren County, IL. The GIS map provides parcel boundaries, acreage, and ownership information sourced from the Warren County, IL assessor. Our valuation model utilizes over 20 field-level and macroeconomic variables to estimate the price of an individual plot of land. There are 7,561 agricultural parcels in Warren County, IL. In Illinois, soil productivity ratings are determined by the optimal Productivity Index (PI) as outlined in Bulletin 811.The average PI rating in Warren County, IL is 128. The average farmland value estimate in Warren County, IL is $10,174/ac. Soil information is sourced from the Web Soil Survey developed by the National Cooperative Soil Survey and operated by the USDA Natural Resources Conservation Service (NRCS). Crop history information is sourced from the NASS Cropland Data Layer (CDL).