Czech addresses write the house number as two figures split by a slash and a five-digit PSČ carried with a space, both of which Western checkout forms tend to flatten. Get the number pair or the code wrong and Česká pošta routes the parcel to the wrong district. Here is the correct format, a real example, and the mistakes that trigger returns.
A Czech label is recipient, optional company, the street with its house number, then the PSČ and town on one line, then the country. There is no region or province line.
Jan Novák personal or business recipientPříklad s.r.o. optional, above the street lineVinohradská 1511/230 house number comes after the street; two figures split by a slash are the descriptive and orientation numbers100 00 Praha 10 5-digit PSČ first with its space, then the town, on one lineCZECH REPUBLIC required for inbound international shipmentsThe PSČ (poštovní směrovací číslo) defines the delivery district and drives Česká pošta sorting. It sits before the town on the same line, the reverse of the US city-then-ZIP order, and the space after the third digit is part of the standard format.
The country-specific rules that generic autocomplete and single-line address fields tend to get wrong.
Many Czech buildings carry two numbers: a descriptive number (číslo popisné) and an orientation number (číslo orientační), written together as 1511/230. The orientation number after the slash is the one used on the street, so keeping only one figure can send a courier to the wrong door.
A Czech postal code is five digits split as NNN NN, for example 100 00. A form that strips the space to 10000 still parses, but the spaced form is the postal standard and the safest to store for lookups.
Česká pošta writes the PSČ ahead of the town on the same line: 100 00 Praha 10. Forms built for the US city-then-ZIP order reverse this and confuse address parsers.
Czech uses accented letters such as č, ř, š, ž and ů. Street and town names like Náměstí Míru lose meaning when the marks are stripped inconsistently, which can cause mismatches against carrier address data.
Each of these passes a basic "is this field filled in" check but fails at the carrier, turning into a redelivery, a return, or an address correction fee.
1511/230 pair can point to the wrong building.NNN NN spacing, or absent entirely, slows Česká pošta's automated sorting.Praha 10 100 00 reverses the expected 100 00 Praha 10 order.Plzeň and Plzen across systems can cause address mismatches.Praha 10 makes a large-city address harder to route.How the major carriers handle Czech Republic addresses, and what your label needs to satisfy each one.
The national postal operator and last-mile partner for most inbound international mail. Sorting is PSČ-driven, so a valid five-digit code is the single most important field on the label.
The dominant domestic parcel and pickup-point networks for Czech ecommerce. They expect the street-with-house-number and a clean PSČ plus town line for accurate home or locker delivery.
International carriers for inbound shipments. Include the country line; they charge address-correction fees when a PSČ or house number forces a manual fix.
Address Guard checks Czech Republic addresses against carrier and postal databases before the order ships, normalizes the format, and flags the errors that cause failed deliveries. 240+ countries, $0.05 per check.
Part of the Address Guard international address format guide, covering 240+ countries.