Cit ê só͘cāi ê gígiân khoânkéng putcí'á chùbī. The major languages in town are 温州話 (Mand: Wenzhouhua), locally known as "本地話", and a language called 蛮話 (Mand: Manhua) that resembles none of its neighbors. More on this one later. The main language of the prefecture (蒼南 ... Chonglâm?) at large is actually -- U guessed it -- Banlamese, locally known as "Hokkiàn'oē". Rumor has it a few other languages are spoken around here too. There's one or more kinds of Hokciu / Hokciu-oid languages. There's also a kind of Northern Wu. There are ethnic 畲 in the outback that speak Hakka. For chitchat with outsiders, there's Mandarin. And Wenzhouhua itself is a family of poàⁿ-sio-thong (partly mutually intelligible) dialects.
Hokkien is third fiddle in Long Kong. It's kind of out-of-range in Long Kong. It's not a language U can use to approach a random stranger, b/c they probably don't speak it. It's not uncommon to hear it in public. I read somewhere that Chonglâm Hokkien has Coânciu roots. From what I've heard so far, it doesn't have the singsong quality of seaward Coânciu dialects, or Klang Hokkien.
Back to 蛮話 Manhua. Off topic but fascinating, to a hoanná like myself.
This language is spoken by about 200,000 people in the area. These people are actually called 蛮話人. They've descended on Long Kong from around the countryside in great numbers since the start of the economic boom. They're kind of taking over the town. They have a reputation for being (even) more hard-working and go-getting than the Wenzhou-speaking "locals". Their language is related to 蛮講 (Mand: Manjiang), the lingua franca of 泰順 Prefecture to the west. From what I've gathered off the web, 蛮講 is a cross between a Hokciu-type language and some indigenous tongue. I saw some "data" on a forum -- it seems to be about as Sinicized as Vietnamese. Adjectives follow nouns, etc. Wild, wild stuff. Meanwhile 蛮話 has come under influence from Wenzhouhua and Hoklo. It has a much more "Sinitic" character.Hoklo is spoken in pockets and on islands all the way up through the "Boat Hill" Islands (舟山) as well as down the coast all the way to the Hoklo heartland...
This aside, though, these scholars seem to be interesting and humorous people, and they come up with cool insights regarding the history of it all. 
Some netizens are saying that Manhua 蛮話, in a nutshell, is a more Sinicized version of Mango. In fact I think there's "evidence" of this in the show-and-tell thread on PKUCN. 