Here’s (most) of the sprawling map, which is part of the new exhibit “Mastering the Metropolis: New York and Zoning, 1916–2016” at the Museum of the City of New York. Cross hatches indicate areas with overlapping industries, while flesh-colored ones were “unrestricted as to industry”.
A quick scan indicates much of 1919 New York was involved in the production of women’s wear. This market involved 8,091 factories (the most out of all the industries), employed 169,965 people, and had a yearly product value of $1.7 billion.
The Upper East Side, Midtown East, and Williamsburg had a role in “food products and tobacco”—coffee, chewing gum, pickles, poultry, cigarettes, snuff, and other toothsome items. Clinton Hill/Bedford-Stuyvesant was big on leather goods like boots, trunks, and harnesses, while neighborhoods along the riverside in Brooklyn and Queens were hubs of metal-working, churning out tin and sheet iron, calculating machines and cash registers, pins and hooks, nuts, washers, stoves, and shipbuilding doodads.