A leading city planning and zoning consultant has here assembled and analyzed detailed information as to the amounts of land actually in use for apartments, single-family houses, stores, streets, parks, and the other important urban purposes in twenty-two representative American cities for which he has prepared plans. On the basis of these facts, he suggests the amounts of land that should properly be allotted for the essential urban uses in cities in various population groups between 5,000 and 300,000. Blighted districts and severe economic losses, he maintains, have resulted from the excessive land speculation and undue optimism which have too often warped the zoning of American cities. This study supplies an indispensable fact basis for scientific zoning, of value to everyone concerned with urban land and its best use.