The title sheet shall contain the subdivision number, conspicuously placed at the top of the sheet, and the location of the property being subdivided with reference to maps which have been previously recorded, or by reference to the plat of a United States survey. A subdivision name may be added below the subdivision number. The subdivision number shall be larger print and dominant to any name title. In case the property included within the subdivision lies wholly in unincorporated territory, the following words shall appear in the titles “In the County of Contra Costa.” If partly in unincorporated territory and partly within an incorporated city, the following words shall be used: “Lying within the County of Contra Costa and partly within the City of .”