Photo of campus

Visitor Information

For the Safety of Our Staff and Visitors
Chart noting COVID-19 community levels and masking guidance for the Johns Hopkins APL campus
The current COVID-19 Community Level for Howard County, Maryland, is Low. Masking is optional on the Johns Hopkins APL campus.

All persons visiting APL must be free from any illness or symptoms common to COVID-19.

Visitors who are required to check in for a badge must complete the COVID-19 daily health check to enter the main campus and other APL facilities. Staff members and visitors who are not fully vaccinated must maintain physical distance from others.

Currently proof of a negative test is not required to enter APL facilities. Screen testing of unvaccinated visitors has been suspended.

Visitors with a take-home picture badge (not required to check in on arrival) must be fully vaccinated to enter the main campus and other APL facilities. These visitors can use this FedRAMP-certified secure form to enter proof of their vaccination status.

Staff and visitors are not required to wear a mask regardless of community level or vaccination status. Those who prefer to wear masks should continue to do so. We ask everyone to be considerate of those who choose to mask, and to consider wearing masks when working closely with others who are wearing them. These policies apply to all APL field offices unless precluded by state or local requirements.

For additional health and safety information, including guidance on events hosted at APL, view our Visitor Health and Safety Guidelines.

What You Need to Know Before Coming to APL

APL is a secure facility, operating under Department of Defense regulations for restricted entry. All visits must be preapproved via written request and notification by responsible staff members. Staff members hosting visitors are responsible for ensuring that all security requirements are met.

Entry/ID Requirements

Visitors must present photo identification to the lobby receptionists, sign the visitor register, receive the appropriate badge, and remain under escort unless otherwise authorized by Visitor Control. Passports are required for foreign visitors, and permanent residents must present their Permanent Resident Card (green card) for entry to the Laboratory. Questions regarding the status of a visitor’s access to the Laboratory should be directed to Visitor Control (phone: 240-228-5661; fax: 240-228-6400). Visitors attending a meeting should have their visit request faxed to Visitor Control or sent via SMO code 888984.

Restricted/Controlled Items

Visitors should be aware of APL rules for bringing restricted and controlled items, such as electronic devices, on site.


Visitors should park in the designated visitor parking lot closest to the building where the meeting is being held (see APL Campus Maps) unless directed elsewhere by their APL point of contact. When leaving the Laboratory, visitors should ask the security officer or lobby receptionist for the appropriate gate combination to exit the parking lot.

Wireless Coverage

APL has a Guest wireless network that is available for general use by visitors to the APL campus. Ask an APL staff member for details.

Getting to APL


The following airports are within driving distance to APL’s main campus.

Baltimore/Washington International Thurgood Marshall Airport (BWI) (Maryland)
Information: 410-859-7111 or 800-435-9294, Ground Transportation

Dulles International Airport (Virginia)
Information: 703-572-2700, Ground Transportation

Reagan National Airport (Washington, DC)
Information: 703-417-8000, Ground Transportation

Area Train Service

Taking public transportation? Visit the sites below to find the most convenient AMTRAK and Metrorail routes.


Metrorail (Washington, DC, subway) and Metrobus (Washington, DC)
Information: 202-637-7000