Converting state name abbreviations to full state names using ArcGIS Field Calculator

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08-19-2020 02:22 PM
AndresCastillo
MVP Regular Contributor
'''
The function is defined in the code block.
The function is executed in the expression.
Hit the 'verify' check mark to ensure the expression is valid.

After the run, check for remaining null values in the calculated field.
Nulls indicate your state abbreviations were not defined in the dictionary.
https://gis.stackexchange.com/questions/16423/converting-state-name-abbreviations-to-full-names-using-arcgis-field-calculator
'''

# Expression:
#  <FIELD> =
stateNames(!STATE_ID!)

# Code Block
def stateNames(stateAbbreviation):
    states = {
            'AK': 'Alaska',
            'AL': 'Alabama',
            'AR': 'Arkansas',
            'AS': 'American Samoa',
            'AZ': 'Arizona',
            'CA': 'California',
            'CO': 'Colorado',
            'CT': 'Connecticut',
            'DC': 'District of Columbia',
            'DE': 'Delaware',
            'FL': 'Florida',
            'GA': 'Georgia',
            'GU': 'Guam',
            'HI': 'Hawaii',
            'IA': 'Iowa',
            'ID': 'Idaho',
            'IL': 'Illinois',
            'IN': 'Indiana',
            'KS': 'Kansas',
            'KY': 'Kentucky',
            'LA': 'Louisiana',
            'MA': 'Massachusetts',
            'MD': 'Maryland',
            'ME': 'Maine',
            'MI': 'Michigan',
            'MN': 'Minnesota',
            'MO': 'Missouri',
            'MP': 'Northern Mariana Islands',
            'MS': 'Mississippi',
            'MT': 'Montana',
            'NA': 'National',
            'NC': 'North Carolina',
            'ND': 'North Dakota',
            'NE': 'Nebraska',
            'NH': 'New Hampshire',
            'NJ': 'New Jersey',
            'NM': 'New Mexico',
            'NV': 'Nevada',
            'NY': 'New York',
            'OH': 'Ohio',
            'OK': 'Oklahoma',
            'OR': 'Oregon',
            'PA': 'Pennsylvania',
            'PR': 'Puerto Rico',
            'RI': 'Rhode Island',
            'SC': 'South Carolina',
            'SD': 'South Dakota',
            'TN': 'Tennessee',
            'TX': 'Texas',
            'UT': 'Utah',
            'VA': 'Virginia',
            'VI': 'Virgin Islands',
            'VT': 'Vermont',
            'WA': 'Washington',
            'WI': 'Wisconsin',
            'WV': 'West Virginia',
            'WY': 'Wyoming'
    }
    if stateAbbreviation is not None:
        if stateAbbreviation in states:
            return states[stateAbbreviation]
        else:
            return None    
    else:
        return None
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