district of a town; city block (irregular size)
A numbered subdivision within a Japanese 町 (chō) or 大字 (ōaza), used in addresses. The size and shape of a 丁目 are irregular and defined administratively, not by a fixed area.
The address is 2-chōme, Nishi-Shinjuku, Shinjuku-ku, Tokyo.
この町は一丁目から五丁目まであります。
This town has chōme from 1 through 5.
I live in Jinnan 1-chōme, Shibuya Ward, Tokyo.
My house is at 3-chōme, 5-banchi, 7-gō, Ginza, Chūō Ward.
丁 (chō) is a counter for blocks or subdivisions, and 目 (me) is an ordinal suffix. Together they form a numbered division within a town district.