Every loan does not have to be inside your assessment area. and as long as you maintain more than 50% of your loans inside your assessment area you are fine.
FYI Census tracts across state lines need to be in a different assessment area.
If you are selecting some tracts you need to make sure that you are including whole geographies and not excluding LMI tracts
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Compliance Analysis and Research - Software for your CRA/HMDA analysis needs