I've noticed that my pronunciation of the word only differs from the General American pronunciation (I'm from coastal California). This is the pronunciation of only that I assume is General American: https://en.wiktionary.org/wiki/File:En-us-only.ogg.
My pronunciation and that of my friends and family is something like [ˈɔn.li] or [ˈon.li].
At first I thought that the first vowel was probably an allophone of /oʊ/, but then I thought how my pronunciation of own is [oʊn], which I think would make a near-minimal pair for the words only and own in my variety of English.
Additionally, my pronunciations of lone and lonely are [loʊn] and [ˈloʊn.li] respectively.
If my observations were typical of most English speakers from urban, coastal California, would that mean my variety of English has an additional vowel phoneme (perhaps /ɔ/ or /o/) compared to General American English that has the cot-caught merger?