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Can I identify the lower 9th ward in New Orleans by zip code or census tracts?
The lower 9th ward falls within zip code 70117. However, that also encompasses some neighborhoods to the west - St. Claude and Bywater.
The lower 9th ward can be defined by census tracts perfectly (including separating out Holy Cross from the lower 9th).
Below is a link describing New Orleans neighborhoods based on the 1990 census geography
The definition of the lower 9th Ward remains the same in 2010: