Cal. Gov. Code § 57078.5

If the affected territory with respect to a proposed annexation to a city consists of (a) territories that are not contiguous to one another and (b) two or more distinct communities, as defined in the county general plan, the census unincorporated places listing, or other commonly recognized community designation, as determined by the commission, and any one community has more than 250 registered voters, any protest filed pursuant to Section 57078 shall be accounted separately for that community, unless the annexation is proposed pursuant to Section 56375.3.