Heron port is a town introduced in the MMRPG, episodes 9 and 46. In just two adventures, we can find plenty of detail about Heronport, to the point that a proper gazette can be put together with the available information and, in a home-brew campaign, a GM can use it as a possible new dominion for a potential PC to become a new baron.

Heronport (Small town, population 1,104, Wealth 44,160 gp, GP Limit 800; Power Center: Conventional;
Alignment: LN; Authorities: Watch)
Racial Mix: 80% Thonian, 15% High Thonian; 5% other
Religious Shrines: Baldin, Fronaus, Henrin, Mwajin, Odiir, Pacuun, Phellia, Sacwhynne, and Sollus
Background: Located halfway between the City of Maus and Jackport, Heronport is a sizeable town serving as a center of trade in The Haven Peak Region. The town is ran by Mayor Reginald Beespatch (Expert 5th-Level) and has been the mayor for the past eight years. Under his watch, the town has grown prosperous and much in the way of trade and commerce has come in. Due to its location near the Haven Peaks, the town is a center for booming steel forging business, as well as one of the major shippers of coal. With being in easy sailing distance of Dirk’s Cove, the town is know for it’s fishing as well.

In Episode 9, page 36, we can find the sketch of a map as well.

On top of this, we can meet plenty of local NPCs (Gant Eisley the best smith in town, Sy Wevlik a vicious city guard, Jelena the orphan sorcerer, Morna keeper of the town boarding house, Largo her drunken and violent husband, Cutty a vicious smuggler, Jor Fallon young night watchman and Trissa Fallon his wife, Ol' Greenie old half-orc street sweeper that works in the night, Corporal Tobin, Privates Conley and Uladro, Sergeant Halepeg, Private Brin, Gappy Arun the fisherman, Halla the Baker, Red Nell innkeeper, Mr. Santerjal gambler from Jackpot, Finzik first mate, “One-thumb” Gunder a notorious ruffian, Black Pej Hornske, “Gaff-hook” Garney, Brother Vald priest of Mwajin, Mr. Whitfellow owner of a warehouse, Stringbean Glum the gnome from Maus, Lord Mayor Reginald Beespatch, Speedicut the barman, Coleman the mayor's secretary, Captain Voorman of the Watch, Chert Willows old adventurer and soldier, Lorelei of the Shore half-elf priestess of Mwajin, Dead-eye Trumbull Fletcher old archer...)

...and walk into a lot of places (the Gull tavern, the Hill - higher and older part of the town, the Town Hall, the Watch House, the Singing Scallop tavern, the Sea’s Gentle Bosom Inn, the fishing ship Sharktooth, Toad’s Hole Taphouse, the Docks area, Wink Alley red district, The Temple of Mwajin near the Sea Gate, the Free Quarter, the Sails District, Pike Street, The Hammocks boarding house, The Pearl gambling house, The Enthralling Emporium, Whisper Alley...)

In Episode 46 there is also Appendix 1: Out and About in Heronport that provides broader descriptions of the main districts of the town.

Considering that this is just a small town of about 1,000 people, that's really plenty of detail and information!