St. Louis Metro Area: Regional Governance and Intergovernmental Relations

The St. Louis metropolitan area presents one of the most structurally fragmented regional governance landscapes in the United States, with over 90 municipalities concentrated in St. Louis County alone. This page covers the formal and informal mechanisms through which Missouri and Illinois jurisdictions coordinate across the bi-state region, the principal intergovernmental bodies that manage shared infrastructure and services, and the decision boundaries that define where county, municipal, and regional authority begins and ends.

Definition and scope

The St. Louis metropolitan statistical area (MSA), as defined by the U.S. Office of Management and Budget, spans Missouri and Illinois, encompassing St. Louis City, St. Louis County, St. Charles County, Jefferson County, Franklin County, and Lincoln County on the Missouri side, plus Madison, St. Clair, Monroe, and Bond Counties in Illinois. The region contains more than 2.8 million residents distributed across jurisdictions that include independent cities, charter municipalities, townships, and special districts.

A defining structural feature of the Missouri portion is St. Louis City's status as an independent city — it is neither part of St. Louis County nor governed by it. This separation, established under Missouri's 1875 Constitution, means the city and county operate parallel governing structures without a unified county umbrella, creating coordination requirements that most metropolitan areas do not face.

Missouri's county government structure provides the default framework for unincorporated areas, but within St. Louis County, the proliferation of incorporated municipalities means that county jurisdiction applies to only a fraction of the land area for services such as zoning and police.

Scope and limitations: This page covers the Missouri-side regional governance framework and bi-state coordination bodies operating in the St. Louis MSA. It does not address Illinois state law, Illinois county or municipal governance, or federal district-level administrative structures. Missouri statutes cited apply only within Missouri's jurisdiction. Matters governed exclusively by the City of St. Louis charter or St. Louis County ordinances without regional applicability are not addressed in detail here; see St. Louis City Government for city-specific administration.

How it works

Regional coordination in the St. Louis metro operates through three overlapping mechanisms: statutory intergovernmental agreements, bi-state compact agencies, and voluntary councils of governments.

East-West Gateway Council of Governments (EWG) functions as the federally designated Metropolitan Planning Organization (MPO) for the region. Under 23 U.S.C. § 134, MPOs are required for urbanized areas exceeding 50,000 in population and are responsible for the Unified Planning Work Program and the Transportation Improvement Program (TIP). EWG coordinates transportation investment decisions across both Missouri and Illinois member jurisdictions. Its board includes representatives from Missouri counties, Illinois counties, the City of St. Louis, and Bi-State Development.

Bi-State Development (operating as Metro Transit) is a bi-state compact agency created by interstate compact under Missouri Revised Statutes Chapter 70 and corresponding Illinois law. It operates the MetroLink light rail system (36 stations across 38 miles of track) and regional bus services. As a compact agency, it holds independent legal status and is not subordinate to either state's executive branch for day-to-day operations.

Missouri's Chapter 70 (RSMo §70.210–70.320) authorizes political subdivisions to enter cooperative agreements for joint service delivery. This statutory framework underlies a wide range of bilateral and multilateral agreements in the region — covering emergency dispatch consolidation, shared municipal court services, joint stormwater management, and road maintenance cost-sharing between municipalities and St. Louis County.

The following enumerated structure identifies the primary intergovernmental coordination layers:

  1. Compact agencies — Bi-State Development, established by formal interstate compact ratified by both Missouri and Illinois legislatures and approved by Congress
  2. Federally mandated MPO — East-West Gateway Council of Governments, designated under federal surface transportation law
  3. Voluntary regional councils — Multi-jurisdictional bodies such as the St. Louis County Municipal League, which represents the interests of over 90 municipalities in collective negotiations and legislative advocacy
  4. Statutory cooperative agreements — Bilateral or multilateral contracts under RSMo §70.220 covering specific shared services without creating new governmental entities
  5. Special districts — Independent taxing and service districts, including Metropolitan St. Louis Sewer District (MSD), which operates under a separate bi-county charter

The Metropolitan St. Louis Sewer District provides a distinct contrast to the cooperative agreement model. MSD was created by a voter-approved charter in 1954 and holds independent authority to levy taxes, issue bonds, and enforce sewer regulations across St. Louis City and St. Louis County. Unlike a cooperative agreement — which requires ongoing consent from both parties — MSD's charter authority is self-executing within its defined service territory. Missouri's special districts framework governs the general legal structure within which MSD and similar entities operate.

Common scenarios

Regional coordination mechanisms are most actively engaged in four recurring contexts:

Transportation capital planning: When a new MetroLink extension or major highway interchange is proposed, EWG's TIP process requires agreement among Missouri Department of Transportation (MoDOT), Illinois DOT, local jurisdictions, and Bi-State Development before federal Surface Transportation Program funds can be programmed.

Emergency services consolidation: St. Louis County municipalities have consolidated dispatch operations under RSMo §70.820 (911 service consolidation authority) into regional centers such as the St. Louis County Emergency Communications Center. Municipalities that consolidate cede operational control but retain policy oversight through joint governance boards.

Land use at municipal boundaries: Because St. Louis County contains municipalities with no buffer of unincorporated land between them, zoning decisions in one municipality can directly affect neighboring jurisdictions. There is no regional zoning authority; each municipality retains independent zoning power, making boundary conflicts a recurring intergovernmental negotiation issue.

Stormwater and sewer jurisdiction: MSD's charter authority covers both St. Louis City and St. Louis County but does not extend to St. Charles County or Jefferson County, which maintain separate systems. Projects that cross these county lines require intergovernmental agreements rather than a single unified authority, frequently producing multi-agency coordination requirements for watershed management.

Decision boundaries

Determining which governmental unit holds authority requires applying a layered analysis:

City of St. Louis vs. St. Louis County: The independent city boundary is absolute for most purposes. St. Louis City functions as both a city and a county for Missouri law purposes (RSMo §§ 82.010–82.020). County-level services — courts, assessor, recorder of deeds, prosecuting attorney — are administered by city-level equivalents inside the city. St. Louis County's government has no jurisdiction inside the city's boundaries.

Municipal vs. County authority in St. Louis County: For the 90-plus incorporated municipalities, municipal ordinances govern land use, licensing, and local police within their corporate limits. St. Louis County's authority applies to the unincorporated remainder. Residents in unincorporated areas receive county-administered services; residents inside municipalities interact with municipal government for those same functions.

Bi-state vs. single-state authority: Bi-State Development and EWG hold authority that crosses the Missouri-Illinois state line. Missouri state agencies — including MoDOT and the Missouri Department of Natural Resources — hold authority only within Missouri. Where a project or regulatory matter involves both states, federal law (typically through the Federal Highway Administration, Federal Transit Administration, or EPA) provides the coordinating framework.

Regional bodies vs. member jurisdictions: EWG and the St. Louis County Municipal League are advisory or planning bodies; they cannot override member jurisdiction ordinances or compel local action outside federally funded program requirements. Bi-State Development and MSD, by contrast, hold independent statutory or charter authority and can act without case-by-case municipal consent within their defined service territories.

Professionals and researchers navigating Missouri government structures across multiple scales will find the Missouri Government index a useful orientation point for locating agency-specific and jurisdiction-specific reference material.

References