The majority of the members are assigned to the thirteen field Troops, A through M and the turnpike Troops, X and Y. These field troopers are responsible for patrolling Oklahoma's 111,994 miles of city, county, and state maintained roads and highways. Field troopers are first responders to emergency situations from traffic collisions to natural disasters and civil disorders. Troopers provide everyday service to the public, whether it be a motorist assist or promoting Oklahoma to a visitor in the state. Troopers are prepared and willing to assist any law enforcement agency when asked and perceptive to take the initiative to offer assistance when needed. (Select a map region above for the address and phone number of the field troops.)

Personnel in this section provide airborne assistance to OHP ground units in traffic enforcement, manhunt and search and rescue operations. This division also provides state administrative personnel with transportation. The department currently operates a fleet of 9 fixed-wing aircraft and 2 helicopters. OHP is the only state agency currently maintaining and operating a fleet of aircraft.

Troop SO is a unit of specially trained Troopers that perform criminal interdiction throughout Oklahoma. Members utilize interviews, canines, and other equipment to detect and arrest criminals of all types as they travel the highways of Oklahoma. The Asset Forfeiture component of Troop SO tracks all arrests in state and federal courts, where the Oklahoma Highway Patrol may be involved in the seizure of property.

The Capitol Patrol Section is responsible for law enforcement, police services, safety and protection of the State Capitol Complex in Oklahoma City and Tulsa. Troop R has primary responsibility in providing for the safety and security of all three branches of Oklahoma State government. Troop R is also the primary law enforcement agency for over 70 state facilities and thousands of citizens, visitors, elected officials, and employees each day.

The primary function of Troop S, commonly referred to as Size and Weights, is providing the safest environment for motorists by enforcing commercial motor vehicle laws and Federal Motor Carrier regulations. By employing innovative and effective enforcement strategies based upon statistical data, the troopers of Troop S pursue public safety through the reduction of commercial vehicle crashes.

The Oklahoma Highway Patrol Training Division is responsible for the entry-level academy training and continuing education of all department employees. Troop T operates a dormitory style academy to house cadets and staff members. The Robert R. Lester Training Center has cafeteria services available for all Department of Public Safety employees at the main campus. Troop T has full-time instructors in Collision Investigation & Reconstruction, Firearms, Law Enforcement Driver Training, and Defensive Tactics. Troop T also maintains a pursuit & skills driving facility at Burns Flat, Oklahoma.

Troop W is the Marine Enforcement Division of the Oklahoma Highway Patrol. Troop W provides service to 38 state lakes and recreation areas consisting of 4,385 miles of shoreline and 490,215 surface acres of water. In addition to regular water patrol duties, troopers are called upon to conduct search and rescue missions, investigate boating accidents and drowning incidents and assist state and local authorities in natural disaster situations where their expertise is needed. Troopers also conduct Boating Safety Education Classes throughout the state at schools and civic groups.

Troop Z is the Criminal Investigations Division of the Oklahoma Highway Patrol. They are tasked with conducting major criminal investigations within the scope of Oklahoma State Statutes. These investigations include trooper involved shootings and incidents, fugitive apprehensions, identity and driver license fraud, polygraph examinations, speed-trap investigations, threat assessments, auto theft and all felony crimes that are committed on Oklahoma's Turnpike Systems.

The Oklahoma Highway Patrol Dive Team consists of troopers & supervisors from throughout the state that are specially trained and are certified divers. Their primary purpose is to provide a recovery team at any location in the state of Oklahoma for the recovery of victims, vehicles, and/or evidence from drownings, vehicle or boating accidents, natural disasters, and the investigation of any criminal act involving the waters of the state. The Dive Team also responds to requests for public relations events such as recruiting events, fairs, and other public venues as needed.

The Executive Security Division carries out the Department's statutory mandate to provide protection, security services, and transportation, for the Governor and their immediate family and the Lieutenant Governor.

The Oklahoma Highway Patrol reintroduced Motorcycles in January 1999 after phasing them out in the early 1940's.

Today the Patrol operates a fleet of mostly BMW RT-1200 Police Motorcycles.

In 2011, OHP received a grant and entered into an agreement with the Oklahoma Department of Transportation to promote Motorcycle Safety Education. The Motorcycle Division offers free classes to the public statewide. Along with formal training, the Division also provides escorts for special events such as Presidential visits along with duties assigned by the Chiefs office. Troop MC is also a Specialized Traffic Enforcement Division with Troopers currently stationed in Oklahoma City, Tulsa, and the Kilpatrick Turnpike.

Troop BT consists of highly trained bomb techs and canines that are responsible for 75 counties (excluding Oklahoma and Tulsa). Bomb Technicians utilize robots and other equipment to augment explosive detection. Bomb techs respond to all bomb calls and are Haz-Mat trained to handle chemical events. They also instruct CLEET and local Fire and Police in explosive and hazardous materials awareness.

Troop ESU is comprised of the OHP Tactical Team, Emergency Medical Services Unit (EMSU) and the Emergency Response Team (ERT).

The OHP Tactical Team was first developed in 1978, when the need for a state wide tactical response was recognized. Since its inception, the OHP Tactical Team has grown and become well equipped to respond to today’s high risk threats. The OHP Tactical Team regularly responds to assist with high-risk warrant service, barricaded suspects, hostage situations and any other mission that may require specially trained personnel and equipment.

The OHP EMSU is a group of highly skilled and certified emergency medical personnel. These Troopers have received extensive medical training and equipment that will allow them to treat responders in the field, if injured. The OHP EMSU is prepared to bring medical assistance to responders during high risk events and mass casualty situations.

The OHP ERT is a mobile field force that is trained and equipped to respond to a variety of calls, including: riot/crowd control, search and rescue and large scale perimeter control. The ERT is divided into squads and dispersed throughout the state; this allows the OHP ERT to have a quick response to a variety of calls for assistance.