The Jackport series items are your best maps, bro. Period. :)

I'm currently running Ties that bind, from Zeitgeist Blackmoor campaign main book.
According to the book, the characters should accept the help of "the Snitch of Jackport" and pay him for information, but they decided not to trust the kid and to explore the town by themselves, so I assumed that they walked the town for a while until they got the map in their heads and I decided to hand them over the map.
Well... the first comment is that there is no door in the walls... sometimes obvious things get missed until playtested... ;)

Is the High Temple dedicated to a single deity or more like a pantheon?
Where is the seat of the Captain of the Guard and/or the Mayor/Town Council?

Good question. I guess I need to adress these things in the next update. I think a main gate where the road from the north makes sense. What do you think? Anything else we might need to add to the map?

The town is small, so a single gate may be OK.
In alternative, you could think about a gate to the docks and two more on the two main roads departing from the town (one to the south and the other to the north, where the Elf town is). In alternative, there could be a single, combined gate between the docks and souther exit.

I'd add also an indication about the place where the mayor and the guards are.

Especially in the Old Market area, I'd break a bit the ordered road grid crossing the town perpendicularly.

EDIT: how about a reference for measuring distances as it can be found in many maps?