Sulphur ZIP Directory Coverage
Official USPS city-association material identifies 70663, 70664, and 70665 with Sulphur. These are delivery labels, not drawn city boundaries. For any home, business, or parcel, the controlling public check is USPS By Address. It can standardize the street and unit line and return the ZIP+4 when the address matches.
| ZIP Code | Areas Covered | Post Office | Notes |
|---|---|---|---|
| 70663 | USPS Sulphur city association; exact street coverage varies | Sulphur Post Office, 800 S. Post Oak Road | Verify each address; office phone 337-625-2037 |
| 70664 | Sulphur preferred last-line association in USPS change material | No separate station verified | Older Lake Charles last-line history; subtype unverified |
| 70665 | Sulphur preferred last-line association in USPS change material | No separate station verified | Older Lake Charles last-line history; subtype unverified |
Do not label 70664 or 70665 as PO-box-only. The reviewed free lookup did not verify a delivery subtype or separate station for either code. Historical USPS material also contains Sulphur-related 70661, 70668, and 70669 entries, but those should not be promoted as current primary Sulphur coverage without a live city-and-state result and effective-date check.
Verify Sulphur ZIP Codes
The USPS ZIP Code Lookup offers three distinct searches. By Address answers the street-level question. By City & State lists codes associated with Sulphur, Louisiana. Cities by ZIP checks the preferred or accepted city labels tied to one code. Each result should be saved with the date because postal associations can change.
| USPS mode | Required fields | Useful result | Limit |
|---|---|---|---|
| By Address | Street, city, state | Standardized address and ZIP+4 | Does not confirm a person or firm at the site |
| By City & State | City, state | Current associated ZIP list | No street boundaries |
| Cities by ZIP | Five-digit ZIP | City and state associations | No parcel ownership or city-limit proof |
The public USPS modes are enough for most checks. The subscription AIS Viewer has deeper city, county, delivery-type, ZIP+4, and effective-date data, but it is not a resident roll.
The manifest-captured USPS lookup interface appears below.
The screen separates exact-address normalization from broad city and ZIP association searches.
Find Sulphur Residents by ZIP
A ZIP code directory narrows a search, but official systems still require more precise facts. The Louisiana voter name lookup requires first name, last name, five-digit ZIP, and birth month and year. The voter address route requires ZIP, address, city, and an optional apartment or lot. The Calcasieu Assessor form does not show a ZIP filter, so search it by street number and street name, parcel, subdivision, legal description, or section-township-range.
- Enter the full street address in USPS By Address and save the standardized ZIP+4.
- Search the Calcasieu Assessor by the standardized street number and name, not by ZIP.
- Check city or parish GIS for the parcel point, boundary, ward, and correct service area.
- Use the five-digit ZIP only in an official portal that asks for it, and retain the other required facts.
- Confirm a record with its custodian before relying on it.
Once the ZIP narrows the area, the Sulphur street directory gives the street-level parcel and deed workflow. A postal result alone never proves who owns, receives mail at, or is present at an address.
Sulphur ZIP Post Office Check
The USPS Sulphur Post Office page verifies the facility at 800 S. Post Oak Road, Sulphur, LA 70663-3664, with phone 337-625-2037. That facility record does not draw the full delivery area, and it does not prove that 70664 or 70665 has the same service type.
The source page captured for the ZIP code directory is shown below.
Use the office page for the verified facility, then use By Address for the exact delivery code.
Sulphur ZIP Voter Fields
The Louisiana Voter Portal name search treats ZIP as one required field, not as a free list of every person in a postal area. It also asks for a name and birth month/year. The address route can return voter records tied to a precise address, subject to Louisiana law and protected-field rules.
| First Name | Required text |
|---|---|
| Last Name | Required text |
| ZIP Code | Required five digits |
| Birth Month/Year | Required in mm/yyyy format |
For help or corrections, the Calcasieu Registrar of Voters lists 337-721-4000 and a West Cal Business Center service point at 500A North Huntington Street in Sulphur. An inactive status needs review with the Registrar and does not prove that a person left an address.
Sulphur ZIPs Versus City Limits
Sulphur's Who Handles What page expressly warns that a Sulphur mailing address may be outside city limits. The postal label routes mail. It does not choose the office for permits, code issues, police records, or other local services. Check the exact point in city or parish GIS before sending a request.
Court areas add another layer. Sulphur City Court Ward 4 reaches outlying Carlyss and Sulphur areas and locations inside and outside Westlake city limits. The 14th Judicial District Court and Calcasieu Clerk remain separate parish routes. Store ZIP, city boundary, court ward, voting precinct, and parcel as separate fields.
- ZIP and ZIP+4
- The five-digit delivery area is broad. The added four digits narrow delivery to a smaller segment.
- PO-box ZIP
- A code or segment used for post-office boxes. No such subtype is verified here for 70664 or 70665.
- Unique ZIP
- A code assigned to one large recipient. None is claimed for the primary Sulphur set.
- Carrier route
- A mail-delivery path within a ZIP. It is not a city, parcel, or resident boundary.
Sulphur ZIP Geography Labels
A Census ZCTA is a statistical shape that approximates ZIP delivery geography. E911 points serve emergency addressing. Tax parcels define land records. Wards and precincts organize courts and elections. None can replace the others, even when their labels seem to overlap in Sulphur.
Use USPS for the postal code, City of Sulphur or Calcasieu GIS for jurisdiction and map layers, the Assessor for the physical parcel address, and the Registrar for election records. Write down the source date. City GIS imagery and parcel data can change, while a postal code may retain an older city association.
A parcel with a 70663 mailing line may sit outside Sulphur, and a city service file may use a boundary that differs from a postal route. Record the five-digit ZIP, standardized city line, parcel jurisdiction, ward, and incorporated status as distinct fields. For an older record, preserve the address as printed because postal labels can change while the land stays in the same place.
This layered check is useful in west Calcasieu Parish, where Sulphur, Carlyss, Westlake, parish territory, and Ward 4 court jurisdiction do not form one border. USPS answers mail delivery. GIS supplies map context. The custodian decides whether its record covers the address.
Historic Sulphur Address Records
Modern ZIP codes should not be projected onto an early Sulphur address. For older place research, compare the 1946 Library of Congress Sanborn set, local newspapers, deeds, assessor legal descriptions, and verified directory volumes. A historic street may use a former name or number, and no official Sulphur renumbering timeline was found.
Search by lot, block, subdivision, or legal description when a modern street match fails. The library can check directories, obituary files, and newspaper reels. The Calcasieu Clerk can help determine how older conveyance books are accessed when the online cutoff is unclear. Keep the old wording and modern standardized address side by side instead of silently replacing one with the other.
Use Sulphur ZIP Results Carefully
The Sulphur ZIP code directory is a geographic starting point. USPS says its lookup does not confirm a person or company at an address. Voter records have statutory protections, and a parcel owner may receive mail elsewhere. Treat every result as a dated field from one official system.
For lawful personal research, compare the standardized postal address, parcel location, and correct government boundary. Ask the custodian for help when fields conflict. Do not use ZIP-based records to stalk, harass, or harm anyone, and do not republish protected personal details.