Editing Marshall County, Illinois (section)

==Geography==
According to the [[U.S. Census Bureau]], the county has a total area of {{convert|399|sqmi}}, of which {{convert|387|sqmi}} is land and {{convert|12|sqmi}} (2.9%) is water.<ref name="census-density"/> The county is distinctly bisected by the [[Illinois River]], splitting the county into two uneven sections.{{Citation needed|date=December 2021}}

===Climate and weather===
{{climate chart
|[[Lacon, Illinois]]
|15|32|1.55
|21|38|1.61
|31|51|3.08
|41|64|3.84
|51|75|4.20
|60|84|4.14
|64|87|4.12
|62|85|3.53
|54|79|3.49
|43|67|2.99
|32|50|3.03
|21|37|2.32
|float=right
|units=imperial
|clear=both
|source=The Weather Channel<ref name="weather">{{cite web
  |url=http://www.weather.com/weather/wxclimatology/monthly/graph/USIL0636
  |title=Monthly Averages for Lacon, Illinois
  |access-date=January 27, 2011
  |publisher=The Weather Channel
}}</ref>}}
In recent years, average temperatures in the county seat of Lacon have ranged from a low of {{convert|15|°F}} in January to a high of {{convert|87|°F}} in July, although a record low of {{convert|-27|°F}} was recorded in January 1999 and a record high of {{convert|103|°F}} was recorded in July 2005. Average monthly precipitation ranged from {{convert|1.55|in}} in January to {{convert|4.20|in}} in May.<ref name="weather"/>

===Major highways===
{{div col}}
* [[Image:I-39.svg|x24px|alt=|link=]] [[Interstate 39]]
* [[Image:US 51.svg|x24px|alt=|link=]] [[U.S. Highway 51]]
* [[Image:Illinois 17.svg|x24px|alt=|link=]] [[Illinois Route 17]]
* [[Image:Illinois 18.svg|x24px|alt=|link=]] [[Illinois Route 18]]
* [[Image:Illinois 26.svg|x24px|alt=|link=]] [[Illinois Route 26]]
* [[Image:Illinois 29.svg|x24px|alt=|link=]] [[Illinois Route 29]]
* [[Image:Illinois 40.svg|x24px|alt=|link=]] [[Illinois Route 40]]
* [[Image:Illinois 89.svg|x24px|alt=|link=]] [[Illinois Route 89]]
* [[Image:Illinois 117.svg|x24px|alt=|link=]] [[Illinois Route 117]]
* [[Image:Illinois 251.svg|x24px|alt=|link=]] [[Illinois Route 251]]
{{div col end}}

===Adjacent counties===
* [[Bureau County, Illinois|Bureau County]] - northwest
* [[Putnam County, Illinois|Putnam County]] - north
* [[LaSalle County, Illinois|LaSalle County]] - east
* [[Woodford County, Illinois|Woodford County]] - south
* [[Peoria County, Illinois|Peoria County]] - southwest
* [[Stark County, Illinois|Stark County]] - west

===National protected area===
* [[Chautauqua National Wildlife Refuge]] (part)