Ricardian and von Thunen land rent models are combined into a single land u
se share model including farm, forest, and urban land uses. The land share
model is applied to the Southern United States, and elasticities are extrac
ted that measure land share response to changes in population, income, land
values, prices, and costs in counties with different degrees of urbanizati
on. The study explores the effect of treating either rural or urban land as
a residual use. While this practice is common in existing land use studies
, it is found to significantly affect parameter estimates in this county-le
vel analysis.