In the fall of 2011, ed tech startup Boundless set up shop in an office in Boston’s Leather District, a tiny neighborhood sandwiched between Chinatown and the Financial District. Terrible Labs and Yesware would follow in mid-2012.

Since then more than two dozen tech-related companies—including the Techstars Boston accelerator and Startup Institute, and Uber’s local office—have taken up residence in the neighborhood, named for its former status as a leather industry hub.

Yesware also recently relocated into a larger office within the Leather District—to Kneeland Street from Kingston Street—while Panorama Education recently moved to Kingston Street from Cambridge.

Update: Two weeks ago, Happier moved into the Leather District—to South Street from the Innovation District—while HourlyNerd and Cambridge Consultants also recently moved into the district.

NextView Ventures may qualify as the earliest tech-related pioneer in the neighborhood: When it launched in 2010, the firm chose to base its office in the Leather District (and Boundless is one of its portfolio companies).

I’m not aware of an exact set of boundaries for the Leather District (feel free to let me know if this exists), but key streets include South, Lincoln, Kingston, and Kneeland.

Like the neighboring Financial District, startups have flocked to the Leather District because it’s affordable (at least compared to the nearby Innovation District and Kendall Square) and meets the other basic needs of a young tech firm. Phil Beauregard, chief executive of Objective Logistics, told me in April that his criteria amounts to: “is it close to the Red Line, is there food around, and is it safe?” (Objective Logistics was another early company that moved to Kingston Street).

Here’s an interactive map showing who is where in the Leather District. Note that some buildings have a number of companies in them:

And here’s the list. You can sort by street by clicking on “street.”

Along with my own reporting, sources for this list included WeSpire and the Boston Startups Guide.

I’m continuing to look at doing similar lists/maps for other startup-heavy neighborhoods in Boston, Cambridge, and Somerville. Which neighborhood would you like to find out about next? E-mail me or leave suggestions in the comments below. Also, feel free to e-mail or comment with any tech firms in the Leather District that I missed.

Read more: The Financial District’s tech firms (map and list)