// PHP Array: 
$state_list = array('AL'=>'Alabama',  
			'AK'=>'Alaska',  
			'AZ'=>'Arizona',  
			'AR'=>'Arkansas',  
			'CA'=>'California',  
			'CO'=>'Colorado',  
			'CT'=>'Connecticut',  
			'DE'=>'Delaware',  
			'DC'=>'District Of Columbia',  
			'FL'=>'Florida',  
			'GA'=>'Georgia',  
			'HI'=>'Hawaii',  
			'ID'=>'Idaho',  
			'IL'=>'Illinois',  
			'IN'=>'Indiana',  
			'IA'=>'Iowa',  
			'KS'=>'Kansas',  
			'KY'=>'Kentucky',  
			'LA'=>'Louisiana',  
			'ME'=>'Maine',  
			'MD'=>'Maryland',  
			'MA'=>'Massachusetts',  
			'MI'=>'Michigan',  
			'MN'=>'Minnesota',  
			'MS'=>'Mississippi',  
			'MO'=>'Missouri',  
			'MT'=>'Montana',
			'NE'=>'Nebraska',
			'NV'=>'Nevada',
			'NH'=>'New Hampshire',
			'NJ'=>'New Jersey',
			'NM'=>'New Mexico',
			'NY'=>'New York',
			'NC'=>'North Carolina',
			'ND'=>'North Dakota',
			'OH'=>'Ohio',  
			'OK'=>'Oklahoma',  
			'OR'=>'Oregon',  
			'PA'=>'Pennsylvania',  
			'RI'=>'Rhode Island',  
			'SC'=>'South Carolina',  
			'SD'=>'South Dakota',
			'TN'=>'Tennessee',  
			'TX'=>'Texas',  
			'UT'=>'Utah',  
			'VT'=>'Vermont',  
			'VA'=>'Virginia',  
			'WA'=>'Washington',  
			'WV'=>'West Virginia',  
			'WI'=>'Wisconsin',  
			'WY'=>'Wyoming');

// List of States
/*

Alabama
Alaska
Arizona
Arkansas
California
Colorado
Connecticut
Delaware
District Of Columbia
Florida
Georgia
Hawaii
Idaho
Illinois
Indiana
Iowa
Kansas
Kentucky
Louisiana
Maine
Maryland
Massachusetts
Michigan
Minnesota
Mississippi
Missouri
Montana
Nebraska
Nevada
New Hampshire
New Jersey
New Mexico
New York
North Carolina
North Dakota
Ohio
Oklahoma
Oregon
Pennsylvania
Rhode Island
South Carolina
South Dakota
Tennessee
Texas
Utah
Vermont
Virginia
Washington
West Virginia
Wisconsin
Wyoming
*/

// Drupal Select field formatted
/*
AL|Alabama
AK|Alaska
AZ|Arizona
AR|Arkansas
CA|California
CO|Colorado
CT|Connecticut
DE|Delaware
DC|District Of Columbia
FL|Florida
GA|Georgia
HI|Hawaii
ID|Idaho
IL|Illinois
IN|Indiana
IA|Iowa
KS|Kansas
KY|Kentucky
LA|Louisiana
ME|Maine
MD|Maryland
MA|Massachusetts
MI|Michigan
MN|Minnesota
MS|Mississippi
MO|Missouri
MT|Montana
NE|Nebraska
NV|Nevada
NH|New Hampshire
NJ|New Jersey
NM|New Mexico
NY|New York
NC|North Carolina
ND|North Dakota
OH|Ohio
OK|Oklahoma
OR|Oregon
PA|Pennsylvania
RI|Rhode Island
SC|South Carolina
SD|South Dakota
TN|Tennessee
TX|Texas
UT|Utah
VT|Vermont
VA|Virginia
WA|Washington
WV|West Virginia
WI|Wisconsin
WY|Wyoming
*/
// HTML form select list with abbreviations
/*
<select name="state" size="1">
	<option value="AK">AK</option>
	<option value="AL">AL</option>
	<option value="AR">AR</option>
	<option value="AZ">AZ</option>
	<option value="CA">CA</option>
	<option value="CO">CO</option>
	<option value="CT">CT</option>
	<option value="DC">DC</option>
	<option value="DE">DE</option>
	<option value="FL">FL</option>
	<option value="GA">GA</option>
	<option value="HI">HI</option>
	<option value="IA">IA</option>
	<option value="ID">ID</option>
	<option value="IL">IL</option>
	<option value="IN">IN</option>
	<option value="KS">KS</option>
	<option value="KY">KY</option>
	<option value="LA">LA</option>
	<option value="MA">MA</option>
	<option value="MD">MD</option>
	<option value="ME">ME</option>
	<option value="MI">MI</option>
	<option value="MN">MN</option>
	<option value="MO">MO</option>
	<option value="MS">MS</option>
	<option value="MT">MT</option>
	<option value="NC">NC</option>
	<option value="ND">ND</option>
	<option value="NE">NE</option>
	<option value="NH">NH</option>
	<option value="NJ">NJ</option>
	<option value="NM">NM</option>
	<option value="NV">NV</option>
	<option value="NY">NY</option>
	<option value="OH">OH</option>
	<option value="OK">OK</option>
	<option value="OR">OR</option>
	<option value="PA">PA</option>
	<option value="RI">RI</option>
	<option value="SC">SC</option>
	<option value="SD">SD</option>
	<option value="TN">TN</option>
	<option value="TX">TX</option>
	<option value="UT">UT</option>
	<option value="VA">VA</option>
	<option value="VT">VT</option>
	<option value="WA">WA</option>
	<option value="WI">WI</option>
	<option value="WV">WV</option>
	<option value="WY">WY</option>
</select>
*/
// HTML form select list with full names
/*
<select name="state" size="1">
	<option value="AL">Alabama</option>
	<option value="AK">Alaska</option>
	<option value="AZ">Arizona</option>
	<option value="AR">Arkansas</option>
	<option value="CA">California</option>
	<option value="CO">Colorado</option>
	<option value="CT">Connecticut</option>
	<option value="DE">Delaware</option>
	<option value="DC">Dist of Columbia</option>
	<option value="FL">Florida</option>
	<option value="GA">Georgia</option>
	<option value="HI">Hawaii</option>
	<option value="ID">Idaho</option>
	<option value="IL">Illinois</option>
	<option value="IN">Indiana</option>
	<option value="IA">Iowa</option>
	<option value="KS">Kansas</option>
	<option value="KY">Kentucky</option>
	<option value="LA">Louisiana</option>
	<option value="ME">Maine</option>
	<option value="MD">Maryland</option>
	<option value="MA">Massachusetts</option>
	<option value="MI">Michigan</option>
	<option value="MN">Minnesota</option>
	<option value="MS">Mississippi</option>
	<option value="MO">Missouri</option>
	<option value="MT">Montana</option>
	<option value="NE">Nebraska</option>
	<option value="NV">Nevada</option>
	<option value="NH">New Hampshire</option>
	<option value="NJ">New Jersey</option>
	<option value="NM">New Mexico</option>
	<option value="NY">New York</option>
	<option value="NC">North Carolina</option>
	<option value="ND">North Dakota</option>
	<option value="OH">Ohio</option>
	<option value="OK">Oklahoma</option>
	<option value="OR">Oregon</option>
	<option value="PA">Pennsylvania</option>
	<option value="RI">Rhode Island</option>
	<option value="SC">South Carolina</option>
	<option value="SD">South Dakota</option>
	<option value="TN">Tennessee</option>
	<option value="TX">Texas</option>
	<option value="UT">Utah</option>
	<option value="VT">Vermont</option>
	<option value="VA">Virginia</option>
	<option value="WA">Washington</option>
	<option value="WV">West Virginia</option>
	<option value="WI">Wisconsin</option>
	<option value="WY">Wyoming</option>
</select>
*/

Different formats for listing states.

United States List, Array and Form Input

list, array, drupal

PHP