On old light poles was a black square, with stenciled #'s. Top # was a 1-2 digit code, which was actaully the 'hun-ert' block you were on.
i.e. 24 = 2400 block, or 4 = 400 block. The bottom # was the light pole on that block. I am sure there were 3 digit ones on south side, but never saw them in person.
Now, not on the poles anymore,
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