OpenStreetBlock
github.com/fruminator/openstreetblock
Repository
fruminator/openstreetblock
Simple web service for turning a lat/lon into a block name (e.g. "5th avenue between president st and union st") using OpenStreetMap data
From the page
Saved with the link. Notes from 2007 to 2016 are mostly the page's own words, so this is probably an excerpt.
OpenStreetBlock is a web service for turning a given lat/lon coordinate into a textual description of the actual city block to which the coordinate points using OpenStreetMap data.