ESROT
Databases
Voice & signaling
SIP response codes
Q.850 cause codes
Mobile & SMS
SMPP error codes
MCC / MNC database
Mobile operators
Numbering & location
World countries — ISO & dialing
ISO 3166-2 subdivisions
Emergency numbers
Numbering plans
India STD codes
Postal / ZIP codes
Guides
SIP & protocols
SIP call flow
History of SIP
Platforms
Asterisk guide
G.729 codec
Asterisk solutions
Vicidial guide
Tools
Network
My IP address
DNS lookup
WHOIS lookup
QR code generator
SMS counter
Security & dev
Password generator
Hash generator
UUID generator
Encoder / decoder
Cron builder
Finance & general
IBAN validator
SWIFT codes
IFSC codes
Age calculator
Lorem ipsum
Unit converter
India
Lookup
Mobile number lookup
PIN code decoder
Mandi prices
STD codes
RTO codes
Coverage & society
5G coverage
UPI stats
Demographics
Election results 2026
2024 general election
Global
Codes & identifiers
HTTP status codes
World countries — ISO & dialing
ISO 3166-2 subdivisions
Emergency numbers
Currency codes
Domain extensions
World reference
Time zones
Public holidays
World population
More
Telecom news
Events
Telecom facts
Abbreviations
Blog
EN
हिंदी
Home
›
Postal Codes
›
United States
› 21023
Postal Code 21023 — Butler, United States
Maryland · Baltimore
English
Postal Code
21023
Place
Butler
State / Region
Maryland
District
Baltimore
Country
United States
Coordinates
39.5330, -76.7432
⌖
Butler map location
Coordinates: 39.5330, -76.7432
Open location on OpenStreetMap
Nearby postal codes
21020
Boring · Maryland
21152
Sparks Glencoe · Maryland
21155
Upperco · Maryland
21030
Cockeysville · Maryland
21071
Glyndon · Maryland
21065
Hunt Valley · Maryland
21136
Reisterstown · Maryland
21031
Hunt Valley · Maryland
← Back to United States postal codes