The Johnie Hammond papers date from 1970 to 2006 and measure 5 linear feet. The papers are arranged in nine series: Biographical Information, Board of Supervisors, Correspondence, Speeches, Bills, Legislative Press, Legislative Campaigns, Research Files, and Artifacts. The bulk of the collection consists of the correspondence and research files.

The Biographical Information series (2006) contains a biographical information form completed by Hammond, her resume, and a campaign biography. The Board of Supervisors series (1970-1978) contains materials pertaining to Hammond's campaigns and work on the Story County Board of Supervisors.

The rest of the collection relates to Hammond's career in the legislature. The Correspondence series (1982-2002) contains letters to Hammond from her constituents, voicing their opinions and concerns on a wide range of topics. Some of Hammond's responses to these letters are included, usually attached to the constituent letter.

The Speech Research series (1996-2002 and undated) includes topical research files for five of Hammond's speeches. They include notes, newspaper clippings and pamphlets. Some of them include a copy of the speech. The Speeches series (1984-2003 and undated) includes approximately fifty speeches Hammond delivered to the legislature and groups such as the League of Women Voters, labor unions, health organizations, prison reformers, churches, and students. Some of the topics include health care reform, prison reform, foster care, welfare reform and poverty. Hammond's farewell address from 2002 is also included. The speeches are arranged chronologically.

The Bills series (1983-2002) includes the official sponsor's copy of bills and resolutions written and introduced to the legislature by Hammond. Some of the topics addressed in these bills are tobacco, worker's rights, sex discrimination, juvenile crime, health, sex offenders and human services.

The Legislative Press series (1982-2002) includes local newspaper clippings concerning Hammond's bills and other legislative issues. Many contain quotes from Hammond.

The Legislative Campaign series (1982-2002) includes brochures, mass mailings to constituents, newspaper clippings, and fundraising materials from Hammond's campaigns for representative and senator.

The Research Files series (1981-2003) contains Hammond's research on approximately ninety topics related to legislative bills and controversial issues. They include newspaper and magazine articles, informational pamphlets from special interest groups and organizations, and some letters. The files are arranged alphabetically.

The Artifacts series (undated) contains a decorated box lid, created by Hammond's pages. This was a tradition in the Iowa legislature for packing files at the end of every session.