Charles Ellicott Commentary Jeremiah 11:13

"For according to the number of thy cities are thy gods, O Judah; and according to the number of the streets of Jerusalem have ye set up altars to the shameful thing, even altars to burn incense unto Baal." — Jeremiah 11:13 (ASV)

According to the number of your cities ... —This and Jeremiah 11:12 reproduce what we have already heard in Jeremiah 2:27-28; Jeremiah 7:17.

The “shameful thing” is, as in Jeremiah 3:24, the image of Baal, which would seem to have been set up openly in some prominent place in every city of Judah, every street of Jerusalem. The reference is probably made, as before, to the formal recognition of Baal-worship in the days of Manasseh (2 Kings 21:3; 2 Chronicles 33:3), but the sin may have been repeated as soon as the restraint of Josiah’s reign had been removed.