Missouri cities/counties with bicycle helmet laws

The Bicycle Helmet Safety Institute maintains a list of cities, counties, and states nationwide that have bicycle helmet requirements.  Below, from that list, are the cities and counties in Missouri that have bicycle helmet requirements--you'll notice that most bicycle helmet requirements in Missouri are focused on children age 16 and younger and most such laws are in St. Louis County::

State Jurisdiction Ages/Conditions Effective Date
Missouri      
  St Louis County 1 to 16 * Unincorp. areas 2002/ Countywide 2008
  St Louis County municipalities of: - - - - - -
  Ballwin Under 17 2006
  Bel-Ridge All ages 2002
  Bella Villa Under 17 2005
  Bellefontaine Neighbors Under 17 2005
  Berkeley All ages 2000
  Black Jack All ages 2008
  Calverton Park All ages 2001
  Chesterfield Under 17 2008
  Clayton Under 17 2005
  Creve Coeur All ages 2000
  Ellisville Under 17 2005
  Florissant Under 17 2003
  Glendale All ages 2008
  Grantwood Village All ages 2003
  Hanley Hills Under 17 2007
  Hazelwood Under 17 2007
  Hillsdale    
  Moline Acres Under 17 2008
  Normandy Under 17 2004
  Northwoods Under 17 2003
  Norwood Court Under 17 2004
  Olivette All ages 2005
  Overland Under 17 2005
  Pagedale All ages 2002
  Riverview Under 17 2008
  Rock Hill Under 17 2003
  St. John Under 17 2001
  Sycamore Hills All ages 2008
  Town & Country All ages 2002
  Velda City All ages 2006
  Velda Village Hills All ages 2005
  Vinita Terrace Under 21 2001
  Webster Groves Under 17 2004
  Wellston    
  Wilber Park Under 17 2005
  Wildwood Under 17 2005
  St Louis Co Parks Under 17 2001
  - - - - - - - - -
  Municipalities in other counties    
  Columbia Under 16 * 2003
  St Charles Under 16 2006