| Association | Website | Acronym | State |
| Alabama Private Investigators Association | http://www.apia-online.com/ | APIA | Alabama |
| Alaska Investigators Association | AIA | Alaska | |
| Arizona Association of Licensed Private Investigators | http://www.aalpi.org/ | AALPI | Arizona |
| Southern California Fraud Investigators Association | http://www.scfia.org/ | SCFIA | California |
| California Association of Licensed Investigators | http://scfia.org/ | CALI | California |
| Professional Investigators of California | http://pica-association.org/ | PICA | California |
| Professional Private Investigators Association of Colorado | http://ppiac.org/ | PPIAC | Colorado |
| Colorado Society of Private Investigators | http://www.coloradoprivateinvestigators.org/ | CSPI | Colorado |
| Connecticut Associations of Licensed Private Investigators | http://www.calpi.net/ | CALPI | Connecticut |
| Delaware Association of Detective Agencies | DADA | Delaware | |
| Florida Association of Licensed Investigators | http://www.fali.org/ | FALI | Florida |
| Florida Association of Private Investigators | http://www.myfapi.org/ | FAPI | Florida |
| Georgia Association of Professional Private Investigators | http://www.gappi.org/ | GAPPI | Georgia |
| Investigative and Security Professional Association of Georgia | ISPAG | Georgia | |
| Private Investigators Association of Idaho | http://www.piai.us/ | PIAI | Idaho |
| Professional Private Investigators Association of Idaho | http://www.ppiaidaho.com/ | PPIAI | Idaho |
| Associated Detectives & Security Agencies of Illinois, Inc. | http://adsai.org/ | ADSAI | Illinois |
| Indiana Association of Professional Investigators | http://www.iapi.net/ | IAPI | Indiana |
| Indiana Society of Professional Investigators | http://www.indianainvestigators.com/ | INspi | Indiana |
| Iowa Association of Private Investigators | http://www.iowa-investigators.com/ | IAPI | Iowa |
| Kansas Association of Licensed Investigators | http://www.k-a-l-i.org/ | KALI | Kansas |
| Kentucky Professional Investigators Association | http://www.kpia.org/ | KPIA | Kentucky |
| Kentucky Society of Professional Investigators | http://www.kspi.org/ | KSPI | Kentucky |
| Louisiana Private Investigator’s Association | http://www.lpia.net/ | LPIA | Louisiana |
| Maine Licensed Private Investigators Association | http://mlpia.org/ | MLPIA | Maine, New England area |
| Professional Investigators Alliance of Maryland | http://www.maryland-investigators.com/ | PIAM | Maryland |
| Maryland Investigators and Security Association | http://misahq.com/ | MISA | Maryland |
| Licensed Private Detectives Association of Massachusetts, Inc. | http://www.lpdam.com/ | LPDAM | Massachusetts |
| Michigan Council of Professional Investigators | http://www.mcpihome.com/ | MCPI | Michigan |
| Minnesota Association Of Private Investigators | http://www.mapi.org/ | MAPI | Minnesota |
| Missouri State Investigators Association | http://www.mosia.com/ | MSIA | Missouri |
| Montana Association of Private Investigators and Security Operators | http://www.mapiso.org/ | MAPISO | Montana |
| Nebraska Association of Licensed Private Investigators | http://www.nalpi.org/ | NALPI | Nebraska |
| Nevada Society of Professional Investigators | http://www.nvspi.org/ | NVSPI | Nevada |
| New Hampshire League of Investigators | http://www.nhli.net/ | NHLI | New Hampshire |
| New Jersey Licensed Private Investigators Associations | http://www.njlpia.org/ | NJLPIA | New Jersey |
| New Jersey Special Investigators Association | http://njsia.memberlodge.org/ | NJSIA | New Jersey |
| Private Investigators Association of New Mexico, Inc | PIANM | New Mexico | |
| Associated Licensed Detectives of New York State | http://www.aldonys.org/ | ALDONYS | New York |
| Society of Professional Investigators | http://www.spionline.org/ | SPI | New York |
| North Carolina Association of Private Investigators | http://www.ncapi.com/ | NCAPI | North Carolina |
| Ohio Assication of Security and Investigation Services | http://www.ohoasis.com/ | OASIS | Ohio |
| Ohio Investigators Association | http://oia.homestead.com/ | OIA | Ohio |
| Oklahoma Private Investigators Association | http://www.opia.website/ | OPIA | Oklahoma |
| Oregon Association of Licensed Investigators Inc. | http://www.oali.org/ | OALI | Oregon |
| Pennsylvania Association of Licensed Investigators | http://www.pali.org/ | PALI | Pennsylvania |
| Licensed Private Detectives Association of Rhode Island | http://lpdari.org/ | LPDARI | Rhode Island |
| South Carolina Association of Legal Investiagtors | http://www.scalinv.com/ | SCALI | South Carolina |
| Tennessee Professional Investigators Association | http://www.tpia.com/ | TPIA | Tennessee |
| Tennessee Association of Investigators | http://www.taionline.org/ | TAI | Tennessee |
| Tennessee Association of Licensed Professional Investigators | http://www.talpi.org/ | TALPI | Tennessee |
| Texas Association of Licensed Investigators | http://www.tali.org/ | TALI | Texas |
| North Texas Private Investigators Associations | http://www.ntpia.org/ | NTPIA | Texas |
| Private Investigors Association of Utah | http://www.piau.com/ | PIAU | Utah |
| Vermont Association of Investigative and Security Services | http://vaiss.org/ | VIASS | Vermont |
| Private Investigators Association of Virginia | http://www.piava.org/ | PIAVA | Virginia |
| Virginia Professional Investigators and Security Association | http://www.vapisa.com/ | VAPISA | Virginia |
| Pacific Northwest Association of Investigators | http://pnai.com/ | PNAI | Washington State |
| Washington Association of Legal Investigators | http://www.wali.org/ | WALI | Washington State |
| Private Investigator and Security Professionals of West Virginia | http://www.pispwv.org/ | PISPWV | West Virginia |
| Profesional Association of Wisconsin Licensed Investigators | https://www.pawli.com/ | PAWLI | Wisconsin |