| City: | Boyers, Pennsylvania |
| City Alias: | Annandale |
| Names to Avoid: | Natl Agency For Check Inqu |
| County: | Butler County |
| Timezone: | Eastern (GMT -05:00) |
| Local Time: | 4:03:57 PM |
| Population: | No Population Data |
| Area Codes: | 582 / 724 / 814 |
| Classification: | Unique [Company/Government] |
| Coordinates: | 41.1086, -79.8995 |
| Quick Link: |
The National Agency Check with Inquiries facility operates under dedicated ZIP code 16018 at the Iron Mountain underground complex in Butler County, Pennsylvania. NACI is a background investigation process used for federal employment and security clearances, and this secure facility near Boyers stores documents related to those proceedings. The underground location, situated in a former limestone mine about an hour north of Pittsburgh, provides protection for sensitive personnel records dating back decades.
The Office of Personnel Management uses this same underground complex for its Investigations Service, maintaining security clearance documentation separate from retirement records. The mine's origins date to 1902 when U.S. Steel began extracting limestone for steel production. By 1954, the abandoned caverns were repurposed for secure government storage. This dedicated postal designation has served the NACI function for over two decades, with both Boyers and Annandale listed as valid mailing cities for correspondence.
| Residential: | 0 |
| Business: | 4 |
ZIP Code 16018 is assigned to a single organization or institution. Detailed business demographics are not published for unique ZIP Codes.
| # Residential Mailboxes: | 0Source: USPS |
| # Business Mailboxes: | 0Source: USPS |
| Total Delivery Receptacles: | 4Source: USPS |
| Single Family Delivery Units: | 0Source: USPS |
| Multi Family Delivery Units: | 0Source: USPS |
| # of Businesses: | 0Source: CBP |
| 1st Quarter Payroll: | $0Source: CBP |
| Annual Payroll: | $0Source: CBP |
| # of Employees: | 0Source: CBP |
ZIP Code 16018 is located in Butler County, Pennsylvania, within the Pittsburgh, PA Metropolitan Statistical Area (CBSA 38300) and Pennsylvania's 16th Congressional District. This Metro area has a population of 2,443,921 people, about 0.00% of whom live in ZIP Code 16018. It covers 0 sq mi of land and a water area of 0 sq mi.
| CBSA Name: | Pittsburgh, PASource: Census |
| CBSA Number: | 38300Source: Census |
| CBSA Type: | MetroSource: Census |
| CBSA Division: | --Source: Census |
| CBSA Population: | 2,443,921Source: Census |
| MSA: | Pittsburgh, PA MSASource: Census |
| Land Area: | --Source: Census |
| Water Area: | --Source: Census |
| Congressional District: | 16Source: USPS |
| Congressional Land Area: | 997.68 sq miSource: Census |
| PMSA: | --Source: Census |
| Intro Date: | < 2004-10Source: ZIP-Codes.com |
| Place FIPS Code: | --Source: Census |
| Place Name: | --Source: Census |
We could not locate which school district 16018 belongs to, but we will update this once new district data is released. There are no public schools nor private schools with a mailing address in this ZIP Code. Listing Nearby schools instead. It also has 6 colleges, universities or post secondary education institutions nearby which would be a short commute to.
Our sources include trusted federal and licensed data from the United States Postal Service, U.S. Census Bureau, U.S. Geological Survey, Centers for Medicare & Medicaid Services, and the National Center for Education Statistics, along with proprietary datasets created by ZIP-Codes.com. Data last updated on January 1, 2026.