The CSA was overwhelmingly rural. Few towns had populations of more than 1,000 – the typical county seat had a population of fewer than 500. Cities were rare; of the twenty largest U.S. cities in the 1860 census, only New Orleans lay in Confederate territory – and the Union captured New Orleans in 1862. Only 13 Confederate-controlled cities ranked among the top 100 U.S. cities in 1860, most of them ports whose economic activities vanished or suffered severely in the Union blockade. The population of Richmond swelled after it became the Confederate capital, reaching an estimated 128,000 in 1864. Other Southern cities in the border slave-holding states such as Baltimore, Washington, D.C., Wheeling, Alexandria, Louisville, and St. Louis never came under the control of the Confederate government.