CBP Ports of Entry: Types, Locations, and Operations

U.S. Customs and Border Protection designates specific locations — called ports of entry — as the only lawful points through which people and goods may enter the United States. This page covers the statutory definition of a port of entry, the operational mechanics that govern processing, how port types differ by mode of transportation, and the tradeoffs that shape enforcement priorities. Understanding port-of-entry structure is essential for travelers, importers, and anyone examining how CBP fulfills its dual mandate of facilitating lawful commerce while intercepting contraband, inadmissible persons, and prohibited goods.

• Definition and scope
• Core mechanics or structure
• Causal relationships or drivers
• Classification boundaries
• Tradeoffs and tensions
• Common misconceptions
• Checklist or steps
• Reference table or matrix

Definition and scope

A port of entry (POE) is a location officially designated under federal law where CBP officers are authorized to conduct inspections and admit — or deny — the entry of travelers, vehicles, cargo, and goods into the United States. The legal foundation rests primarily in Title 19 of the United States Code (Customs duties) and Title 8 (Immigration and Nationality Act), which together grant CBP the authority to establish and staff these checkpoints (U.S. Code, Title 19; U.S. Code, Title 8).

CBP's Office of Field Operations administers ports of entry through a nationwide network of field offices and port directors. As of the most recent official count published by CBP, the United States operates 328 ports of entry across land, air, and sea (CBP Ports of Entry list). These 328 locations collectively process hundreds of millions of travelers and trillions of dollars in trade annually, making them the primary interface between the U.S. economy and the global movement of people and goods.

Every person entering the United States — including U.S. citizens — must present themselves at a designated port of entry and submit to inspection. Entering between ports of entry constitutes an illegal entry and is handled separately by CBP Border Patrol, which operates between ports rather than at them.

Core mechanics or structure

Processing at a port of entry follows a two-stage inspection model. Primary inspection is the first contact point, where a CBP officer reviews travel documents, queries the traveler's identity against law enforcement databases, and makes an initial admissibility determination. For most travelers this contact lasts under two minutes. For cargo, primary review involves automated manifest review through the Automated Commercial Environment (ACE) system before the shipment physically arrives.

Secondary inspection is a deeper examination triggered when primary screening flags anomalies — document discrepancies, database hits, behavioral indicators, or random selection for compliance sampling. At secondary, officers may conduct detailed document inspection, luggage searches, vehicle searches, or interviews. The secondary inspection process operates under authority derived from 19 U.S.C. § 1467 and 8 U.S.C. § 1225, which together require that any arriving alien submit to inspection.

Land ports additionally use inbound lane configurations — personal vehicle lanes, pedestrian lanes, commercial truck lanes — each feeding into separate processing infrastructure. The largest land ports, such as San Ysidro (California) and Laredo (Texas), operate 24 hours a day, 7 days a week. San Ysidro is the busiest land border crossing in the Western Hemisphere, processing more than 70,000 northbound vehicle crossings on peak days (CBP San Ysidro port statistics).

Air ports of entry function through Federal Inspection Service (FIS) areas within international terminals, where CBP co-locates with TSA and USDA Agriculture specialists. Biometric collection — fingerprints and facial recognition — is now standard at all major international airports under the Biometric Entry-Exit Program authorized by 8 U.S.C. § 1365b.

Causal relationships or drivers

The geographic distribution of ports of entry reflects trade volume, population density along border corridors, diplomatic reciprocity agreements, and Congressional authorization. Ports cannot be created by agency discretion alone; opening a new port requires Congressional action or funding, which constrains CBP's ability to respond rapidly to shifting traffic patterns.

Trade agreements drive staffing and infrastructure investment. The United States-Mexico-Canada Agreement (USMCA), which replaced NAFTA in 2020, increased the volume of pre-cleared commercial shipments and accelerated the adoption of trusted trader programs such as C-TPAT. When a larger share of cargo enters under trusted-shipper status, resources at the port level can shift toward higher-risk, non-enrolled shipments.

Risk targeting systems — primarily the Automated Targeting System (ATS) — generate risk scores for travelers and cargo prior to arrival. ATS cross-references manifests, advance passenger information, and intelligence feeds to assign inspection priority before the shipment or traveler reaches the primary lane. This upstream filtering directly determines which fraction of arriving cargo undergoes physical examination; CBP physically inspects approximately 3 percent of all arriving cargo containers (CBP Trade Statistics, as reported in Government Accountability Office analysis of CBP operations).

Classification boundaries

Ports of entry are classified by mode of transportation and operational capability:

Land ports are located along the 1,954-mile U.S.-Mexico border and the 5,525-mile U.S.-Canada border. They process passenger vehicles, pedestrians, buses, and commercial trucks. Some land ports are limited-hours facilities that close overnight.

Air ports of entry are designated international airports authorized to receive international flights. Not every airport with international service has full CBP staffing; some smaller airports operate as user-fee airports, meaning airlines or airport operators pay CBP directly for inspection services under 19 U.S.C. § 58b.

Sea ports of entry include commercial seaports processing containerized cargo, cruise terminals processing passengers, and small vessel reporting stations. Sea ports fall under overlapping jurisdiction between CBP and the U.S. Coast Guard for maritime enforcement.

Preclearance facilities represent a fourth category: CBP inspection stations located on foreign soil — currently operating at 15 locations in 6 countries including Canada, Ireland, and the United Arab Emirates (CBP Preclearance program page). Travelers who clear CBP preclearance arrive in the U.S. as domestic passengers, bypassing FIS processing.

The distinction between a port of entry and a border crossing checkpoint is significant. Interior CBP checkpoints — such as those on Interstate highways in Texas and New Mexico — are not ports of entry. They lack authority to admit persons into the country; they function as enforcement checkpoints within the national border zone.

Tradeoffs and tensions

The fundamental operational tension at every port of entry is facilitation speed versus inspection depth. Processing delays at major ports generate measurable economic costs: the Federal Highway Administration has documented that a one-minute increase in average wait time at the San Diego–Tijuana crossings reduces annual cross-border economic output by hundreds of millions of dollars (FHWA Border Program research). At the same time, reducing dwell time reduces the probability of detecting contraband.

Staffing levels amplify this tension. CBP has consistently reported officer shortages at high-volume ports. The CBP Workload Staffing Model — an internal methodology referenced in GAO audits — has identified staffing gaps of over 3,000 officers relative to workload at peak periods (GAO-17-466, CBP Staffing). Understaffing compresses inspection windows and increases reliance on automated systems that cannot replicate all aspects of physical inspection.

A second tension exists between trade enforcement and revenue collection. CBP collected $80 billion in tariffs and trade revenue in fiscal year 2022, making it the second-largest source of federal revenue after the Internal Revenue Service (CBP Trade Statistics FY2022). Aggressive enforcement actions — holds, examinations, seizures — slow cargo flow and can damage relationships with compliant importers. Port directors must balance enforcement intensity against the economic function of facilitating lawful trade.

Common misconceptions

Misconception: Any international airport can process international arrivals.
Correction: Only airports officially designated as air ports of entry may receive international flights with foreign nationals aboard. An aircraft landing at a non-designated airport with international passengers aboard is in violation of federal law. Designation requires formal CBP authorization and typically dedicated FIS infrastructure.

Misconception: CBP officers at ports of entry only check for illegal immigration.
Correction: CBP at ports of entry simultaneously enforces customs law, agricultural inspection requirements (in coordination with USDA), public health regulations, export controls, intellectual property rights, and trade enforcement — not solely immigration law. The mission scope is broader than commonly understood.

Misconception: Secondary inspection means a traveler is suspected of a crime.
Correction: Secondary referral does not indicate criminal suspicion. Random sampling for compliance purposes, document processing queues, and additional biometric collection all generate secondary referrals with no adverse inference. Secondary inspection is an administrative process, not an arrest or detention for criminal purposes.

Misconception: U.S. citizens cannot be denied entry at a port of entry.
Correction: U.S. citizens have the right to enter the United States and cannot be denied entry or deported. However, they may be detained for investigation, questioned extensively, and — if suspected of crimes — referred to law enforcement. The right of entry does not preclude enforcement of criminal statutes at the port.

Checklist or steps

The following sequence describes the standard processing stages a traveler encounters at a CBP air port of entry:

1. Pre-arrival data submission — Airline transmits Advance Passenger Information System (APIS) data to CBP before departure; ATS generates a risk assessment.
2. Biometric collection — Upon arrival at FIS area, traveler submits to facial image capture or fingerprint scan at automated kiosk or CBP officer station.
3. Document presentation — Traveler presents passport (and visa if required) to CBP officer at primary inspection booth.
4. Database query — Officer queries TECS (Treasury Enforcement Communications System) and other law enforcement databases against traveler identity.
5. Oral declaration — Traveler declares accompanying goods, currency over $10,000, and agricultural items per CBP Form 6059B requirements.
6. Primary determination — Officer issues admission (stamp or I-94 record), refers to secondary, or initiates expedited removal proceedings.
7. Secondary inspection (if referred) — Traveler proceeds to secondary area; officers conduct additional document review, interview, or baggage examination.
8. Agricultural and currency screening — USDA Agriculture specialists and CBP officers may examine food items, plants, and financial instruments.
9. Final admission or action — Traveler is admitted with appropriate status annotation in CBP systems, or formal action (withdrawal of application, parole, removal) is initiated.

For commercial cargo, the parallel sequence begins with ACE entry filing days before vessel arrival and concludes with cargo release notification transmitted electronically to the importer of record.

Reference table or matrix

The cbpauthority.com home page provides orientation to the full scope of CBP's regulatory authority across all operational domains, including how port-of-entry operations intersect with trade, immigration, and security mandates.

For the broader context of how ports of entry fit into CBP's organizational mission, the CBP mission and history page covers the agency's consolidation under the Department of Homeland Security in 2003 and the structural changes that followed.

CBP travel and entry requirements addresses document requirements and admissibility standards that travelers must meet before reaching the primary inspection lane.