Here's the latest on genealogy websites where you can find the 1940 census and which states you can search by an ancestor's name:
Ancestry.com: Record images for all US states and territories are available free, as are searchable name indexes for Delaware, Nevada and Washington, DC. A chart on the 1940 census page lets you see indexing progress.
Archives.com: At this 1940 Census Community Project partner site, you can search name indexes to Colorado and Delaware. To access the unindexed portion of the census, this site sends you to the National Archives' 1940 census site (which Archives.com designed and hosts).
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