1916 - First birth control clinic in America opened by Margaret Sanger in Brooklyn, New York. All founders arrested and indicted under the Comstock Law.
1920 - The 19th Amendment to the U.S. Constitution is ratified - women win the right to vote.
1921 - The first American Birth Control Conference held in NYC results in founding of American Birth Control League.
1926 - First Birth Control League in Pennsylvania is launched in Luzerne County.
1927 - Birth Control Services is launched in Berks County, housed in Readings Community General Hospital.
1930 - Hannah Feller establishes and operates the Maternal Health Center out of the basement of a house located on Cameron Street, Harrisburg. She secures its funding by personally soliciting local businessmen.Center is staffed exclusively by unpaid volunteers.
1932 - First Northampton County birth control clinic opens in Easton.
1932 - Maternal Health Center founded in Lancaster.
1934 - Luzerne County's first birth control clinic opens in Wilkes-Barres Kirby Health Center.
1935 - Lackawanna County's first birth control clinic opened in Waverly.
1935 - The Maternal Health Center opens in York City. Staffed entirely by volunteers and one paid physician.
1936 - The first family planning clinic in Monroe County opens in basement of the Stroudsburg jail.
1937 - Lackawanna County's second birth control clinic opened in Peckville.
1938 - Lackawanna County's third birth control clinic opened in Moosic.
1942 - The National Birth Control League becomes Planned Parenthood Federation of America.
1948 - Maternal Health Center opens its own office on Orange Street in Lancaster.
1962 -Harrisburg's Maternal Health Center accepted as a member of the National Planned Parenthood Federation under the leadership of James H.King, Esq.Staffed by volunteers, Harrisburg Hospital donates its facilities for weekly clinics.
1964 - Harrisburg's Maternal Health Center opens its own clinic, still staffed by unpaid volunteers.Financial support comes from then Board President,James H. King,Esq.and his successor, Dr. Walter Kirker and his wife, Jeanne.
1972 - Harrisburg's Maternal Health Center is reorganized as a federally-funded Title X agency under the name Tri-County Family Planning Services and is now staffed by paid employees.
1972 - Planned Parenthood of Lancaster County purchases its first building and opens a center on 37 South Lime Street, Lancaster.
1973 - Roe v. Wade, guaranteeing a woman's right to choose abortion, is decided by the Supreme Court.
1975 - St.Luke's Episcopal Church temporarily houses Lackawanna County family planning clinic after a fire. Ten months later the center moves into its new location in the Bank Towers Building and a grant from the Scranton Area Foundation allows the establishment of The Family Life Education Center for developing sexuality education in the community.
1976 - Northampton County's second family planning center opens on Lehigh University campus.
1978 - Lehigh County's first family planning center opens on 13th Street in Allentown.
1981 - Luzerne County's second family planning center opens in Hazeleton.
1982 - Kate Michelman, later the national leader of NARAL, appointed CEO of Tri-County Family Planning Services.
1983 - Planned Parenthood of Northampton County and Planned Parenthood Association of Lehigh County merge to become Planned Parenthood of the Lehigh Valley.
1985 - Elephants Trunk Consignment Shop opens in Emmaus to help raise funds for Planned Parenthood.
1985 - Lancaster County Planned Parenthood launches first capital campaign, resulting in construction of a new, expanded facility on 31 South Lime Street, Lancaster.
1985 - Planned Parenthood of Lackawanna & Wyoming County and Planned Parenthood of Luzerne County merge to become Planned Parenthood of Northeastern Pennsylvania.
1987 - Planned Parenthood of North East PA is created through the merger of four existing affiliates: Planned Parenthood of Berks County, Planned Parenthood of the Lehigh Valley, Monroe County Planned Parenthood, and Planned Parenthood of Northeastern PA.
1989 - HIV testing and counseling launches at clinics throughout northeast PA.
1989 - Lancaster Planned Parenthood opens 31 South Lime Street Clinic.
1989 - PPFA establishes the Planned Parenthood Action Fund, a separate 501(c)(4) organization, for lobbying to preserve the right to reproductive choice.
1990 - Tri-County Family Planning Services becomes Planned Parenthood of the Capital Region in May.
1993 - Planned Parenthood of Lancaster County suffers major arson attack.Services are never interrupted, but building reconstruction lasts six months.
1995 - Planned Parenthood of Lancaster County merges with Planned Parenthood of the Capital Region to form Planned Parenthood of the Susquehanna Valley with the administrative offices located in Harrisburg.
1996 - Bethlehem Health Center relocates to the grounds of St. Luke's Bethlehem.
1998 - Reading Health Center offers first trimester abortions.
2006 - Planned Parenthood Federation of America appoints new head: Cecile Richards, political activist and daughter of Texas Governor Anne Richards.
2008 - Planned Parenthood of the Susquehanna Valley and Planned Parenthood of North East Pennsylvania merge to become Planned Parenthood of Northeast and Mid-Penn.
2012 - Planned Parenthood of Northeast and Mid-Penn and Planned Parenthood Association of Bucks County merge to become Planned Parenthood of Northeast, Mid-Penn & Bucks County.
2013 - Planned Parenthood of Northeast & Mid-Penn and Planned Parenthood of Central Pennsylvania merge to become Planned Parenthood Keystone!