/* minimum font-size for text too small to read */
@media screen and (max-width:660px) {
#dropdownMenu1{font-size: 16px;}
.sidepanel-item_link {font-size: 16px;}
.text-sm {font-size: 16px;}
.top-area-code-box a {font-size: 16px; margin: 32px auto; width: 48px; height: 48px; padding-top: 12px;}
.ls_phone-input-in-main-header {font-size: 16px;}
.ls-btn-switch-search-parameter {font-size: 16px;}
.ls_main-bottom-menu li a {font-size: 16px;}
.ls_directory-bottom-menu li a {font-size: 16px;}
.footer-text p {font-size: 16px;}
.ls_name-input-wrapper-in-main-header {font-size: 16px;}
.ls_header-form-search .nav li>a {font-size: 16px;}
.ls_address-input-wrapper-in-main-header input {font-size: 16px;}
.ls_address-input-wrapper-in-main-header select {font-size: 16px;}
.addressInHeader input {font-size: 16px;}
.addressInHeader select {font-size: 16px;}
.ls_phone-block-full-size .ls_phone-input-wrapper-in-main-header {width: 95%;}
.col-xs-12 {padding-left: 1px; padding-right: 1px;}
.morePadLeftRight {padding-left: 10px; padding-right: 10px;}
.where-is-area p {font-size: 16px;}
.bottom-major-cities>.city span.city {font-size: 16px;}
.bottom-zip-codes>.zip span.zip {font-size: 16px;}
.footer-text .copyright {font-size: 16px;}
.area-code-prefix a {margin-bottom: 16px; margin-top: 16px;}
.bottom-sibling-nav div {padding: 16px 0 11px 15px;}
.bottom-major-cities>.city div {padding: 16px 0;}
.bottom-zip-codes>.zip div {padding: 16px 0;}
}
Phone Prefixes in the 331 Area Code
State: IL
Largest City in Area: AURORA
Where is Area Code 331?
Area code (331) is in the state of IL. Below, are the major
cities in the area code (331).
Area Codes Starting with 3
Major Cities in 331
AURORA, IL (6,610)
CHICAGO, IL (4,085)
NAPERVILLE, IL (4,063)
GENEVA, IL (1,533)
BOLINGBROOK, IL (1,164)
MONTGOMERY, IL (1,106)
OSWEGO, IL (954)
LISLE, IL (924)
SAINT CHARLES, IL (867)
DOWNERS GROVE, IL (846)
Zip Codes in 331
