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