I work on subdivision plans as a civil engineer. In our town, there is a GIS coordinator who works for the city that verifies if the street names we select are available and assigns the street address numbers. I’m not sure what their methodology is for picking the numbers, but most houses in my city have a four digit number. For legal purposes, each lot also has a separate parcel number based on the old tax maps. Those are usually assigned by adding an additional number to the parent parcel number. For example, if there is a 40-acre farm that is getting subdivided into 50 lots for houses. If the farm has a tax map parcel number 12Q, then each lot created from that 40-acre parcel will be assigned parcel numbers 12Q*1 through 12Q*50. Additional numbers and letters are tacked on each time a larger parcel of land is divided into smaller parcels. So, it is possible to have a parcel number like 6C*J*3*26. This means parcel 6C was divided into tracts A through J, tract J was divided into at least 3 parcels, and the third parcel was divided again into smaller lots.
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