Definition
The body of a county. Corpus comitatus refers to the whole county considered as a collective legal entity — its territory and inhabitants taken together — as distinguished from any particular place, locality, or subdivision within it. The phrase appears most often in older procedural and jurisdictional contexts where courts or legal documents needed to specify whether an act, process, or authority extended across the entire county or was limited to a specific part of it.
The term is Latin: corpus (body) and comitatus (county, from comes, a count or sheriff). It functions as a territorial descriptor rather than an independent legal doctrine, marking the geographic and civic scope of county-level legal power.
Common Confusion
CORPUS COMITATUS is not the same as POSSE COMITATUS, though both terms share comitatus and are rooted in the same concept of county power. Posse comitatus means the power or force of the county — specifically, the sheriff's authority to summon able-bodied inhabitants to assist in keeping the peace or executing process. Corpus comitatus is the body itself; posse comitatus is the coercive power drawn from that body. Researchers working in historical criminal procedure or military law sources should take care not to conflate them. The modern Posse Comitatus Act (1878) concerns restrictions on military involvement in civilian law enforcement and draws its name from this older concept, but corpus comitatus does not appear in that statute or its interpretive case law.
CORPUS COMITATUS should also be distinguished from CORPUS DELICTI, which means the body of a crime — the factual proof that a crime occurred. The two phrases share only the word corpus and are otherwise unrelated in doctrine and context.
Why It Matters in Research
Researchers encounter corpus comitatus primarily in three contexts: (1) old English and early American criminal procedure, where venue and jury-selection rules required that certain offenses be tried before the corpus comitatus — meaning a jury drawn from the full county rather than a single hundred or liberty; (2) admiralty and maritime law sources, where the term appears in disputes over whether a court or officer had jurisdiction over the whole county or only a defined port or district; and (3) civil process questions, particularly around the geographic reach of a sheriff's authority.
The single reported case citation appearing across all four source dictionaries — 5 Mason 290 — is Justice Story's circuit court opinion in United States v. Bevans (reported in Mason's Reports), which addressed jurisdictional questions about federal versus state authority over crimes committed aboard vessels in navigable waters. Understanding why Story invoked corpus comitatus in that context — to delineate where state criminal jurisdiction did and did not reach — is essential for reading the surrounding doctrine correctly.
The term has essentially no live usage in modern American law. It survives in historical treatises, early American and English case reports, and as background vocabulary for understanding posse comitatus doctrine. Researchers who encounter corpus comitatus in 18th- or 19th-century sources should read it as a jurisdictional or geographic qualifier, not as an independent doctrine with procedural consequences.
One navigational trap: digital full-text searches across historical case law will return hits for corpus comitatus that are actually discussing the posse or the Posse Comitatus Act. Filter carefully. Similarly, some older indices conflate corpus comitatus entries with habeas corpus entries due to loose cross-referencing under the headword corpus.
Historical Dictionary Support
The four source dictionaries are in close agreement — unsurprisingly, given that Rapalje & Lawrence and Black's appear to track the same phrasing almost verbatim, and Bouvier adds only the gloss "inhabitants or citizens." Burrill's is the most useful of the four for research purposes: it cites Molloy's De Jure Maritimo (1676), Croke's Jacobean reports, Howard's Reports, and Mason's Reports, giving the term its fullest documentary footprint. Burrill also cross-references De corpore comitatus, a variant form worth tracing in older English sources.
None of the dictionaries situates corpus comitatus within a broader procedural framework or explains the circumstances under which courts actually invoked it. The entries treat it as a translation note rather than a working doctrine. Researchers should not treat the dictionary definitions as exhaustive — the operative significance of the phrase in any given case turns on the surrounding jurisdictional rules, not on the Latin phrase itself.
Jurisdictional Note
Corpus comitatus is primarily a term of English common law origin and early American federal and state court usage. It does not appear as a term of art in any modern American statutory scheme. Its significance is essentially historical and confined to pre-20th-century sources.
Encyclopedia Cross-Reference
The Law Mind Military, Veterans & Admiralty Law Encyclopedia: Posse Comitatus Act — Restrictions on Domestic Military Operations and Exceptions [military_17]. Background on the comitatus concept and its transformation into modern statutory doctrine.