Responsible for securing the borders to prevent terrorists and weapons from entering the US, while facilitating the flow of legitimate trade and travel. Collects taxes and import duties through the enforcement of trade and tariff laws.

Works to promote good health, prevent diseases, and prepare for new health threats. Monitors and tracks the incidence of various diseases, including the coronavirus (COVID-19). Publishes information about health indicators and statistics. Issues travel notices about current health issues related to specific destinations. Museum is designed to educate visitors about the value of prevention-based public health, and features exhibits on the history of public health messages and epidemics.

Administers the nation's immigration court system.

Maintains military forces to deter war and to protect the security of the country. Website provides information about the Air Force, Army, Marine Corps, Navy, and Space Force. Note that the Coast Guard is part of the Navy during conflicts and part of Homeland Security in times of peace; the National Guard is a state-based reserve force which can be activated for federal missions. Also provides answers to frequently asked questions and links to additional resources.

Provides information on the prevention and treatment of substance abuse and mental health disorders. Offers extensive information on mental health topics, statistics, conference materials, and links to additional resources. Publishes prevention materials, many of which can be downloaded from the website for free.

Administers programs related to the management and conservation of federal lands and the resources on them, including timber, minerals, watershed, fish and wildlife, and natural, scenic, scientific, and cultural values. Website provides maps which can be viewed online.

Administers health research programs through various institutes, centers, and offices.

Administers programs for veterans. Provides information and assistance in applying for all veterans benefits. Includes information about health care, hospitalization, and outpatient services; mental health and substance abuse treatment; education and training benefits such as the GI Bill; VA home loans; pensions; and death benefits such as burial and cemetery plot allowance, flags, and headstones. Offers referrals to other federal and state agencies that provide services for veterans and their dependents.

Administers health care, research, and information programs. Develops, coordinates, and supports a range of infectious disease initiatives.

Administers district courts in Arizona.

Works to prevent fraudulent, deceptive, and unfair business practices in the marketplace. Provides information to help consumers avoid them.

Administers federal health services to Native Americans in central Arizona.

Administers health care, research, and information programs.

Regulates interstate and international communications by radio, television, wire, satellite, and cable. Accepts and investigates complaints related to obscene or indecent programs, unsolicited advertisements, and tower outages.

Works to improve health and achieve health equity through access to quality services and a skilled health care workforce.

Provides representation of the Canadian government in the United States. Offers information and assistance to people traveling to Canada. Protects the rights and provides assistance to Canadian citizens living or traveling in the United States. Website provides information and various forms.

Administers Veterans Affairs programs and services for veterans and their families in central Arizona.

Provides free, confidential counseling and training in person and over the internet for small businesses owners and those who want to start a small business. Holds workshops for small business owners and those who want to start a small business. All communication is online

Administers Social Security and Medicare programs. Website provides answers to frequently asked questions, and statistics relating to total benefits paid and general breakdown of beneficiary categories. Speakers are available locally to present information about benefits and services for large groups.

Administers programs relating to wage earners, job seekers, and retirees. Works to improve working conditions, advance opportunities for profitable employment, and protect work-related benefits and rights. Tracks statistics on the labor force, occupations, and other national economic measurements.

Provides care for military veterans.

Administers the legal and political relationship between the federal government, and Indian tribes and Alaska Native entities in Arizona.

Administers programs related to the lawful immigration to the United States.

Administers Veterans Affairs programs and services for veterans and their families in northern Arizona.

Administers federal health services to Native Americans in northern Arizona.