Some prominent New Yorkers in 1848 in GeoJSON format (from Doggett's New York City Directory https://archive.org/details/doggettsnewyorkc1848dogg)

doggetts_1848.geojson

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Astor","Address":"87 Prince, h. 37 Lafayette pl","Page and column":"page 31 left top","Occupation":"(property tycoon, became the richest man in the US)","Directory link":"https://archive.org/stream/doggettsnewyorkc1848dogg#page/n37/mode/2up","Wikipedia link":"https://en.wikipedia.org/wiki/William_Backhouse_Astor,_Sr.","NYPL link":"http://archives.nypl.org/mss/141","Photo":"https://upload.wikimedia.org/wikipedia/commons/8/8f/William_Backhouse_Astor_Sr.jpg"},"geometry":{"type":"Point","coordinates":[-73.99824142456055,40.72457155994158]}},{"type":"Feature","properties":{"Name":"Thomas Addis Emmet","Address":"45 William, h. Av. 7 c. W. 13th","Page and column":"page 141 left middle","Occupation":"lawyer (New York State Attorney General)","Directory link":"https://archive.org/stream/doggettsnewyorkc1848dogg#page/n151/mode/2up","Wikipedia link":"https://en.wikipedia.org/wiki/Thomas_Addis_Emmet","NYPL link":"http://archives.nypl.org/collection/1","Photo":"https://upload.wikimedia.org/wikipedia/commons/thumb/6/63/ThomasAddisEmmet.jpg/400px-ThomasAddisEmmet.jpg"},"geometry":{"type":"Point","coordinates":[-73.9998185634613,40.73786018559518]}},{"type":"Feature","properties":{"Name":"Cornelius W Lawrence","Address":"Custom house, h. Manhattanville","Page and column":"page 242 right top","Occupation":"collector of the port (first popularly elected mayor of ny)","Directory link":"https://archive.org/stream/doggettsnewyorkc1848dogg#page/n257/mode/2up","Wikipedia link":"https://en.wikipedia.org/wiki/Cornelius_Lawrence","NYPL link":"http://archives.nypl.org/mss/7680","Photo":"https://upload.wikimedia.org/wikipedia/commons/c/c2/Cornelius_Van_Wyck_Lawrence.jpg"},"geometry":{"type":"Point","coordinates":[-74.01022553443909,40.70731149175845]}},{"type":"Feature","properties":{"Name":"James Lenox ","Address":"Av. 5 c. Twelfth","Page and column":"page 246 right top","Occupation":"(collector)","Directory link":"https://archive.org/stream/doggettsnewyorkc1848dogg#page/n261/mode/2up","Wikipedia link":"https://en.wikipedia.org/wiki/James_Lenox","NYPL link":"http://archives.nypl.org/mss/1732","Photo":"https://upload.wikimedia.org/wikipedia/commons/thumb/f/fd/James_Lenox.jpg/361px-James_Lenox.jpg"},"geometry":{"type":"Point","coordinates":[-73.99415373802185,40.734693757936405]}},{"type":"Feature","properties":{"Name":"Herman Melville","Address":"103  Av. 4","Page and column":"page 282 right bottom","Occupation":"(author)","Directory link":"https://archive.org/stream/doggettsnewyorkc1848dogg#page/n297/mode/2up","Wikipedia link":"https://en.wikipedia.org/wiki/Herman_Melville","NYPL link":"http://digitalcollections.nypl.org/items/ed3ecd60-f2f6-0130-91b4-58d385a7b928","Photo":"https://upload.wikimedia.org/wikipedia/commons/thumb/f/f1/Herman_Melville.jpg/400px-Herman_Melville.jpg"},"geometry":{"type":"Point","coordinates":[-73.98984611034393,40.732360504277665]}},{"type":"Feature","properties":{"Name":"Samuel J. Tilden","Address":"11 Pine, h. 11 Av. 5","Page and column":"page 404 right top","Occupation":"lawyer","Directory link":"https://archive.org/stream/doggettsnewyorkc1848dogg#page/n419/mode/2up","Wikipedia link":"https://en.wikipedia.org/wiki/Samuel_J._Tilden","NYPL link":"http://archives.nypl.org/collection/2","Photo":"https://upload.wikimedia.org/wikipedia/commons/6/60/SamuelJonesTilden.png"},"geometry":{"type":"Point","coordinates":[-73.99597764015196,40.73233611443449]}},{"type":"Feature","properties":{"Name":"William N. Tweed (Boss Tweed)","Address":"240 & 357 Pearl, h. 237 E Broadway","Page and column":"page 411 right top","Occupation":"brushes","Directory link":"https://archive.org/stream/doggettsnewyorkc1848dogg#page/n425/mode/2up","Wikipedia link":"https://en.wikipedia.org/wiki/William_Tweed","NYPL link":"http://archives.nypl.org/mss/4657","Photo":"https://upload.wikimedia.org/wikipedia/commons/thumb/5/5e/William_Magear_%22Boss%22_Tweed_%281870%29.jpg/381px-William_Magear_%22Boss%22_Tweed_%281870%29.jpg"},"geometry":{"type":"Point","coordinates":[-73.9862734079361,40.71419979167853]}},{"type":"Feature","properties":{"Name":"Cornelius Vanderbilt","Address":"9 Battery pl, h. 10 Washington place","Page and column":"page 415 left middle","Occupation":"steamboats (& railroads)","Directory link":"https://archive.org/stream/doggettsnewyorkc1848dogg#page/n429/mode/2up","Wikipedia link":"https://en.wikipedia.org/wiki/Cornelius_Vanderbilt","NYPL link":"http://archives.nypl.org/mss/3147","Photo":"https://upload.wikimedia.org/wikipedia/commons/thumb/5/57/Cornelius_Vanderbilt_Daguerrotype2.jpg/449px-Cornelius_Vanderbilt_Daguerrotype2.jpg"},"geometry":{"type":"Point","coordinates":[-73.99492084980011,40.729376747109306]}},{"type":"Feature","properties":{"Name":"Fernando Wood","Address":"162 South, h. 461 Broome","Page and column":"page 448 right top","Occupation":"shipping merchant (First Tammany Mayor)","Directory link":"https://archive.org/stream/doggettsnewyorkc1848dogg#page/n463/mode/2up","Wikipedia link":"https://en.wikipedia.org/wiki/Fernando_Wood","NYPL link":"http://archives.nypl.org/mss/4686","Photo":"https://upload.wikimedia.org/wikipedia/commons/thumb/c/cf/Fernando_Wood_-_Brady-Handy.jpg/327px-Fernando_Wood_-_Brady-Handy.jpg"},"geometry":{"type":"Point","coordinates":[-74.00116503238678,40.72223388574859]}}]}