
Source: en.wikipedia.org
Adirondack Highlands Iron District – New York – see map below (red dots indicate locations of iron mines)

Source: researchgate.net
Birmingham Iron District – Alabama – see map below (iron ore areas shown in brown and burnt orange)

Source: bhamwiki.com
Cuyuna Iron Range – Minnesota – see map at the top of the post
Gogebic Iron Range – Michigan and Wisconsin – see map at the top of the post
Gunflint Iron Range – Minnesota and Ontario – see map at the top of the post
Hanging Rock Iron Region – Kentucky and Ohio – see map below and the map provided for the Rose Run and Red River Iron District

Source: ohiomemory.org
Iron Furnace Trail – Tennessee – see map below (black triangles depict iron furnace locations)

Source: tnironfurnacetrail.org
Iron River-Crystal Falls Iron Range – Michigan – see map at the top of the post
Marquette Iron Range – Michigan – see map at the top of the post
Maryland Iron Districts – Maryland – see map below (areas orange shown on the map)

Source: scholarship.library.jhu.edu
Menominee Iron Range – Michigan – see map at the top of the post
Mesabi Iron Range – Minnesota – see map at the top of the post
New Jersey Highlands Iron District – New Jersey – see map below (dark red dots indicate iron mining areas)

Source: njgeology.org
Pennsylvania Iron Ranges – Pennsylvania – See map below (dark red dots indicated iron mining areas)

Source; d-scholarship.pitt.edu
Rose Run and Red River Iron Districts – Kentucky – see center part of map below

Source: kgs.uky.edu
Salisbury/Housatonic Iron District – Connecticut and Massachusetts – see map below with mining symbols

Source: mindat.org
Shaw and Tuscarora Iron Belts – North Carolina – see map below

Source: ncgeology.com
Iron Springs District – Utah – see the SW corner of the map below

Source: geology.utah.gov
Vermillion Iron Range – Minnesota – see map at the top of the post
Virginia Iron District – Virginia – see maps below (brownish-red dots indicate the location of iron mines on the first map and the symbols indicate locations of iron furnaces on the second map)

Source: dmme.virginia.gov

Source: dmme.virginia.gov
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