What are common normalization rules for US street addresses?

What are common normalization rules for US street addresses?

• A. Expand abbreviations, standardize directional prefixes/suffixes, trim spaces, split unit numbers, and distinguish PO Boxes from street addresses.
• B. Remove all punctuation and convert to lowercase.
• C. Always convert to all caps and remove spaces.
• D. Normalize by replacing all numbers with X's.

Answer: (A)

Normalizing US street addresses is about turning varied address forms into a single, consistent representation so matching and validation work reliably. Expanding abbreviations ensures that abbreviated forms like St and Ave are treated the same as Street and Avenue. Standardizing directional prefixes and suffixes (such as N, S, E, W and their full-word equivalents) helps align entries like N Main St and North Main Street. Trimming extra spaces removes subtle inconsistencies from typing or data entry. Splitting unit numbers, such as apartment or suite numbers, into a separate component improves matching by keeping the street address and the unit identifier distinct. Distinguishing PO Boxes from street addresses prevents mixing mailbox routes with physical locations, which is crucial for routing and validation. Other approaches, like removing punctuation, lowercasing everything, forcing all caps and removing spaces, or replacing numbers with Xs, erase meaningful distinctions and actual address data, making reliable matching and geocoding far less effective.