Northside Independent School District

Where this district is the answer, and where it is not

The counts below come from the census blocks assigned to Northside Independent, grouped by the ZIP Code area each block falls in. The Census Bureau publishes the blocks; the grouping is computed here, and it is the only place these particular numbers exist.

• Homes inside the boundary267,309
• Residents665,676
• ZIP Code areas it reaches25
• Where it is the only district9
• Where it shares with another district14
• Where it holds under half a percent2
• Land area317 square miles
• Homes per square mile843

The ZIP Code areas it reaches

The spread is the thing to notice. In 78240 this district holds 100% of the homes; in 78242 it holds no homes at all. Same district, opposite answers, and a lookup that names it without the share tells the second household the same thing as the first.

• ZIP Code 78240 · San Antonio, Texas100% of the homes
• ZIP Code 78249 · San Antonio, Texas100% of the homes
• ZIP Code 78251 · San Antonio, Texas100% of the homes
• ZIP Code 78250 · San Antonio, Texas100% of the homes
• ZIP Code 78238 · San Antonio, Texas100% of the homes
• ZIP Code 78023 · San Antonio, Texas100% of the homes
• ZIP Code 78256 · San Antonio, Texas100% of the homes
• ZIP Code 78257 · San Antonio, Texas100% of the homes
• ZIP Code 78255 · Cross Mountain, Texas100% of the homes
• ZIP Code 78254 · San Antonio, Texas99% of the homes
• ZIP Code 78253 · San Antonio, Texas92% of the homes
• ZIP Code 78227 · San Antonio, Texas89% of the homes
• ZIP Code 78229 · San Antonio, Texas84% of the homes
• ZIP Code 78230 · San Antonio, Texas79% of the homes
• ZIP Code 78245 · San Antonio, Texas75% of the homes
• ZIP Code 78228 · San Antonio, Texas42% of the homes
• ZIP Code 78231 · Shavano Park, Texas21% of the homes
• ZIP Code 78248 · San Antonio, Texas14% of the homes
• ZIP Code 78056 · San Antonio, Texas11% of the homes
• ZIP Code 78015 · Fair Oaks Ranch, Texas8.4% of the homes
• ZIP Code 78258 · San Antonio, Texas4.5% of the homes
• ZIP Code 78006 · Boerne, Texas3.6% of the homes
• ZIP Code 78063 · Lakehills, Texas2.1% of the homes
• ZIP Code 78236 · Lackland AFB, Texasno homes at all
• ZIP Code 78242 · San Antonio, Texasno homes at all

The areas it leads without holding most of the homes

Northside Independent is the largest district in 16 ZIP Code areas. Answer with its name alone and the answer misses 31,335 of the 294,644 homes those areas hold — though in 9 of them it holds every home there is. The count is homes, not addresses, and it is the number no lookup prints.

Northside Independent is the largest name in ZIP Code 78228 · San Antonio, Texas and still holds a minority of it: 8,813 of 20,782 homes. The other 11,969 homes are with San Antonio Independent and Edgewood Independent. This is the shape that makes a one-name answer worst — the name is right for fewer homes than it is wrong for.

Northside Independent holds 23,619 of the 31,697 homes in ZIP Code 78245 · San Antonio, Texas, so its name is right for most of the area and wrong for the rest: 8,078 homes with Southwest Independent and Medina Valley Independent.

ZIP Code 78230 · San Antonio, Texas is a two-district area: 16,533 of its 21,014 homes are inside Northside Independent, and the other 4,481 homes are with North East Independent. Which one an address belongs to is settled by the street, not by the five digits.

In ZIP Code 78229 · San Antonio, Texas the split runs 15,472 to 3,024 and the larger part is Northside Independent's: the rest is 3,024 homes with North East Independent and San Antonio Independent.

In ZIP Code 78253 · San Antonio, Texas the split runs 21,369 to 1,841 and the larger part is Northside Independent's: the rest is 1,841 homes with Medina Valley Independent.

Northside Independent is not the name anyone would give for ZIP Code 78258 · San Antonio, Texas — North East Independent leads it — and Northside Independent holds 918 homes there all the same. Answer that area with one name and that is what it is wrong about.

Northside Independent reaches into ZIP Code 78231 · Shavano Park, Texas with 845 of its 3,995 homes, behind North East Independent. The familiar answer for that area is the other name, and it is wrong for those 845 homes.

ZIP Code 78248 · San Antonio, Texas is another area where Northside Independent is present without being the answer: 804 of its 5,910 homes, behind North East Independent.

Who takes the other homes in its ZIP Codes

Northside Independent runs pre-K through grade 12 itself, so an address it holds sees no change of authority between grade school and high school. The districts listed below are the ones that take the other homes in the ZIP Code areas it shares — North East Independent, Boerne Independent and Southwest Independent. They are neighbors on the same postal ground, not the next stop for its own students.

• North East Independent School District34,468 homes in 5 shared ZIP Code areas
• Boerne Independent School District21,376 homes in 2 shared ZIP Code areas
• Southwest Independent School District10,804 homes in 3 shared ZIP Code areas
• San Antonio Independent School District8,847 homes in 2 shared ZIP Code areas
• Medina Valley Independent School District6,253 homes in 4 shared ZIP Code areas
• South San Antonio Independent School District5,735 homes in 2 shared ZIP Code areas

Who it shares ZIP Codes with

Northside Independent shares ZIP Code areas with 12 different districts. The most frequent are North East Independent, Medina Valley Independent, Boerne Independent and Comal Independent. In a neighborhood this crowded the question is not which district serves the ZIP Code but which side of which street an address is on.

• North East Independent School District5 shared ZIP areas
• Medina Valley Independent School District4 shared ZIP areas
• Boerne Independent School District2 shared ZIP areas
• Comal Independent School District2 shared ZIP areas
• Edgewood Independent School District2 shared ZIP areas
• San Antonio Independent School District2 shared ZIP areas

Where this district sits

• School districts in Texas1,238 of 1,976 ZIP areas split
• Every district with a page here260 districts listed

What to do next

Ask the district office to confirm your street address. A district settles that question on its own site: look for a school locator, a find my school tool, or an attendance zone map. Where there is none, ask the office itself.

A ZIP Code is a set of mail delivery routes, not a boundary: in 14 of the 25 ZIP Code areas Northside Independent reaches, at least one other district holds a real share of the homes as well, and the line between them runs along streets. Only the district can say which side of that line an address is on.

This site links to no district website. None of the federal files it is built from publishes one, and a guessed address is worse than none. It is the district office, not a search engine, that settles an address.

If a house purchase depends on the answer, ask the district itself for written confirmation of that exact address. A listing is not a district record, and neither is this page.

What this cannot tell you

The homes were counted in the 2020 Census and the district lines are the 2026 boundary file. Nothing on this page adjusts one to the other. Where houses have been built or cleared since the count, a share here describes the place as it was counted rather than as it stands today, and in the fastest-growing ZIP Code areas that gap is the largest single source of error on this site.

A share on this page is a share of the homes in the ZIP Code area, not a probability for any particular address. Enrollment is decided by street address, and a district may run magnet, charter or choice programs that ignore the boundary entirely. If a decision depends on the answer, the district office is the only authority; this page shows what the federal boundary files say and when they were published.

A district boundary is not a school attendance zone. This site never says which school an address is assigned to: no current national dataset of attendance zones exists, and the district draws them itself. Nor is anything here endorsed or certified by the Census Bureau; we use their published files, and that is the whole of the relationship.

A ZIP Code is a set of mail delivery routes, not an area. What is mapped here is the Census Bureau's ZIP Code Tabulation Area, the closest published approximation to it. The two are not identical, and a handful of ZIP Codes used only for post office boxes or single buildings have no tabulation area at all.

Where these numbers come from

School district boundaries come from the Census Bureau's Census Geographic Relationship File, current 2026 vintage, which assigns every census block to a unified district or to an elementary and a secondary district. Homes and residents in each block come from the 2020 Census Redistricting Data (PL 94-171), H1_001 and P1_001. The ZIP Code areas come from the same Geographic Relationship File, block to ZIP Code Tabulation Area. District names and grade ranges come from the Census Gazetteer 2025, with 2020 for districts no longer listed.

The place name printed beside a ZIP Code comes from the Census 2020 ZIP Code Tabulation Area relationship files: place, county subdivision and county, taken 2026-09-06. It is a label rather than a measurement: the Census Bureau does not publish which post office a ZIP Code belongs to, so the place named is the one covering the most land inside the area, not the city the Postal Service prints on an envelope.

Everything else on this page — the shares, the counts of districts per ZIP, the comparison between the two grade bands, the rankings — is computed here from those files. The source publishes none of it. Snapshot taken 2026-09-03.