- National Association of Counties: Sierra County, NM
- Information about the cities in the county, Census Bureau facts, and list of elected officials.
- National Register of Historical Places: Sierra County, New Mexico
- List of districts, sites, buildings, structures, and objects that are significant in American history, architecture, archaeology, engineering, and culture. Information about the properties and their significance and function.
- Sierra County
- Features an online guide to the county. Gives a services directory, a calendar, recycling information, and a directory containing businesses, organizations, and personal web pages.
- Sierra County Genealogy Trails
- Provides genealogical and historical details including births, surnames, court records, census data, biographies, cemeteries, deaths, disasters, pioneer families and newspapers.
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