You don't have to reinvent the wheel unless you just plain want to.
It would be easier to start a chapter of an existing non-NPC type sorority.
Here is an extensive list of community organizations compiled by BetaRose:
Beta Sigma Phi
Contact:
membership@betasigmaphi.org
Founded: 1931 in Abilene, Kansas
Size: ~9000 active chapters, 250,000 members
Location: All US states, Canadian provinces, and 23 countries.
Purpose: to unite congenially in fellowship and friendship those women accepted for membership; to promote cultural development of such members...; to foster association with each other in pursuit of the liberal arts
Philanthropy: Each chapter determines its own service projects
Delta Chi Sigma
Contact:
K2@teleport.com
Founded: 1925
Location: Chapters in Canada, California, Indiana, Ohio - possibly more.
Delta Sigma Kappa -
Contact: 56 St. Francis Ave, Beech Grove, IN, 46107
Founded: November 24, 1924 in Lafayette, Indiana
Location: Indiana, Ohio
Delta Theta Chi
Contact:
lwopschall@ucsd.edu
Founded: 1920 in Chicago, Illinois
Size: ~43 chapters
Location: Arkansas, California, Indiana, Iowa, Kansas, Kentucky, Ohio, Oklahoma, Missouri, Nebraska, Texas, Washington
Purpose: to promote cultural education, to foster personal development and good citizenship, to form a nation-wide fellowship, to attain a broader outlook and enjoyment of contact with those of similar purposes and ideals.
Philanthropy: Breast Cancer and Literacy
Delta Theta Tau
Contact:
shannot1@muohio.edu
Founded: 1903 in Muncie, Indiana
Size: 120 active chapters and 59 alumnae associations
Location: Arizona, California, Colorado, Florida, Illinois, Indiana, Kansas, Maryland, Missouri, Ohio, Oregon, Tennessee, Texas, Washington
Purpose: Delta Theta Tau Sorority, Inc. is a national women's organization dedicated to the advancement of philanthropy and charity, nonsectarian, nonacademic, promoting welfare for all and fostering the spirit of good fellowship
Philanthropy: Annual national philanthropic project. Last year's project was the National Ectodermal Dysplasia Foundation
Epsilon Sigma Alpha -
Contact:
esainfo@esaintl.com
Founded: 1929 in Jacksonville, Texas
Size: over 1000 chapters
Location: most US states
Purpose: the development of a well-balanced lifestyle that encourages members to develop personal talents to pursue excellence in all aspects of daily life.
Philanthropy: St. Jude’s Children’s Hospital and Easter Seals
Other Info: Epsilon Sigma Alpha has numerous avenues in which to participate. Traditional chapters are open to persons 18 years of age and older, regardless of race, color, creed, or national origin. ESA also features active youth chapters for young women not yet 18 years of age; Collegiate Sorority Chapters to accommodate members within academic settings; and men’s chapters. In addition, an Associate Membership is also available, where individuals and companies can support ESA without belonging to an established chapter.
Kappa Delta Phi -
Location: Florida, Indiana, Kentucky
Purpose: To teach sisterly love, Loyalty to God, to Country and to Kappa Delta Phi. Sublimity of ideals and affections. Intellectual and cultural development. To spread good cheer. To be a social influence in the community. To be of civic service to the community. To honor and perpetuate the glories of American Womanhood
Philanthropy: Occupational therapy education
Other Info: Not affiliated with the collegiate sorority Kappa Delta Phi NAS.
Kappa Kappa Kappa
Contact: Central Office (317)876-7481
Founded: 1901 in Indianapolis, Indiana
Size: 146 active chapters, 130 associate chapters, 11,000 members
Location: Indiana
Purpose: to bring women into close, unselfish relationship for the promotion of charity, culture and education.
Philanthropy: Each Tri Kappa chapter has special projects in its community
Other Info: Exists only within the boundaries of Indiana. Called Tri-Kappa, never KKK.
Lambda Tau Delta
Founded: pre-1929
Purpose: Heartspring, Aid to the Handicapped
Omega Nu
Founded: April 4, 1903
Size: 13 chapters
Location: California
Purpose: serves the own community through charity and service
P.E.O. Sisterhood
Contact: Phone: 515-255-3153
Founded: 1869 at Iowa Wesleyan College
Size: ~250,000 members
Location: US and Canada
Purpose: Friendship is the cornerstone the Founders laid for our unique Sisterhood, and P.E.O. continues to be a source of encouragement and support for women to realize their potential in whatever worthwhile endeavor they choose.
Philanthropy: Education (and they run their own 2-year college)
Phi Beta Psi
Contact:
info@phibetapsi.org
Founded: 1904 in Columbus, Ohio
Size: 87 chapters, 2100 active members
Location: Arizona, California, Florida, Illinois, Indiana, Kansas, Kentucky, Minnesota, New Jersey, New York, Ohio, Oregon, Texas, Washington
Purpose: The purpose of Phi Beta Psi is to participate in charitable work, to promote fraternal relationship among its members and to establish and assist other chapters of Phi Beta Psi.
Philanthropy: Cancer Research
Phi Epsilon Phi
Contact: Phi Epsilon Phi National Office, PO Box 4096, Burlingame, CA 94011-4096
Founded: 1937
Size: 16 chapters
Location: California
Purpose:To strive for increased knowledge, To be impartial in our judgement of others. To reach maturity through an understanding of ourselves. To establish a relationship with those around us, where we practice moderation, tranquility, kindness, and honor. To practice the art of being a friend, and thus, give and gain greater happiness
Philanthropy: Cancer Research and The Alzheimers Association
Phi Tau Omega
Contact:
Tugirl1@aol.com
Founded: March 8, 1925
Size: 36 chapters, 500 active members
Location: Iowa, Kansas, Oklahoma, Missouri
Psi Delta Sigma
Contact:
baydes@aol.com
Founded: February 21, 1921
Size: 6 chapters
Location: California
Philanthropy: United Cerebral Palsy
Psi Iota Xi
Contact:
Psi-Iota-Xi@att.net
Founded: 1897 in Muncie, Indiana
Size: 150 chapters, 5000 active members
Location: Indiana, Ohio, Michigan, Kentucky, Illinois and Tennessee
Purpose: The primary purpose of Psi Iota Xi is to be of service with time, money, and love in cooperation with the community
Philanthropy: Speech and hearing
Sigma Alpha
Contact:
president@sigmaalphasorority.org
Founded: 1913
Size: over 50 chapters
Location: California, Florida, Illinois, Indiana, Kansas, Michigan, Missouri, Ohio, Pennsylvania, and Wisconsin
Philanthropy: Heartspring, a national private residential school for children with severe multiple disabilities.
Other Info: Not affiliated with the agriculture sorority Sigma Alpha.
Sigma Beta
Contact:
chrystie@woh.rr.com
Founded: 1922 in Fort Wayne, Indiana
Size: 37 active chapters
Location: Arizona, Florida, Georgia, Indiana, Maryland, Michigan, and Ohio
Philanthropy: Scholarships for disabled college students and other national charity projects
Sigma Phi Gamma -
Founded: August 29, 1920 in Hartford City, Indiana
Contact:
Location: chapters located across the United States and Canada
Purpose: Promote True friendship among women throughout the world; Work for higher standards among young people; Perform service work whenever and wherever possible.
Philanthropy: helping and giving to the communities in which they live
Theta Sigma Phi
Founded: June 1, 1907
Size: 7 chapters
Location: California
Purpose: To educate disabled students