There is no single North Konkan dialect. There is a Marathi coastal base — recognisably different from the Marathi of the plateau in its vowels and its verb endings — over which each community has laid something: Portuguese vocabulary in the Catholic villages, Hebrew and liturgical Marathi among the Bene Israel, and in the city a contact Hindi that has taken Marathi grammar wholesale. Census returns hide most of this, because almost every speaker of these varieties returns Marathi or Hindi as their language.
AgriIndo-Aryan, Marathi group
The speech of the salt-pan and khar-land cultivators of Raigad, Thane and Panvel. Distinctive verb endings and a well-known intonation that urban Marathi speakers imitate and mock in equal measure.
Speakers: Returned within Marathi in the census; field estimates run to a few million
KoliIndo-Aryan, Marathi group
Several related fishing-community varieties — Son Koli, Mahadev Koli, Mangela — differing between koliwadas only a few kilometres apart, and carrying a technical vocabulary of nets, tides and species that standard Marathi has no words for.
East Indian MarathiIndo-Aryan, Marathi–Konkani transitional
Called Kadodi, Samvedi or Vadvali depending on the village, spoken in the Vasai and Salsette Catholic villages, and carrying a substantial layer of Portuguese loanwords absorbed over two centuries of rule. It is the only Marathi variety normally written in the Roman alphabet as well as Devanagari.
WarliIndo-Aryan, Bhil–Konkani group
Sufficiently distinct from Marathi that older speakers are not reliably intelligible to Marathi speakers, though schooling and television are levelling it fast.
Speakers: Several lakh, largely in Palghar and across into the Dangs
Judeo-MarathiIndo-Aryan, Marathi with Hebrew and Aramaic vocabulary
The Bene Israel variety, written in both Devanagari and Hebrew script. Most of its speakers emigrated to Israel after 1948, and the number who use it daily is now very small.
Bambaiya HindiIndo-Aryan, Hindi contact variety
A city vernacular with Hindi vocabulary over a largely Marathi and Konkani grammatical frame — the dative forms mereko and tereko, the invariable bola, and a lexicon borrowed from Marathi, Gujarati, Konkani and Urdu in the same sentence. It is nobody's mother tongue and everybody's working language.
Parsi GujaratiIndo-Aryan, Gujarati group
A distinct register with its own vocabulary and idiom, historically the language of the Bombay Parsi household and of a substantial theatrical and print tradition.