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Library of Congress - Railroad Maps, 1828-1900 - California

Library of Congress - Sanborn Maps - California

The Library of Congress has placed online nearly 25,000 Sanborn Fire Insurance Maps, which depict the structure and use of buildings in U.S. cities and towns. Maps will be added monthly until 2020, for a total of approximately 500,000. The online collection now features maps published prior to 1900. The states available include Arizona, Arkansas, Colorado, Delaware, Iowa, Kentucky, Louisiana, Michigan, Nebraska, Nevada, North Dakota, South Dakota, Vermont, Wisconsin and Wyoming. Alaska is also online, with maps published through the early 1960s. By 2020, all the states will be online, showing maps from the late 1880s through the early 1960s.

List of former United States counties - California (Wikipedia)

Map Geeks - State & County Maps of California

MAPofUS.org - California Maps and Atlases

Old Maps of New Jersey, Pennsylvania, Indiana, Illinois, Ohio, California, Scotland, Wales, England

Old Maps of Scotland 1859. Handsome reproductions. Also, Ireland, England, Wales.

Perry-Castañeda Library Map Collection

From the University of Texas at Austin.

South East California 1922 Map

U.S. Census Bureau - California County Outline Map

USGenWeb Archives, United States Digital Map Library

Yale Peabody Museum: GNIS - California

Search the USGS Geographic Names Database. You can limit the search to a specific county in this state and search for any of the following features: airport arch area arroyo bar basin bay beach bench bend bridge building canal cape cemetery channel church cliff crater crossing dam falls flat forest gap geyser glacier gut harbor hospital island isthmus lake lava levee locale mine oilfield other park pillar plain ppl range rapids reserve reservoir ridge school sea slope spring stream summit swamp tower trail tunnel valley well woods.