How to Read a Korean Address: Road Names, Lot Numbers and the Building-Number Trick

A Korean address handed to a visitor tends to produce the same reaction: a long string of syllables, a number that seems too large, and no obvious way to tell whether you are two minutes away or twenty. It is a rational system. It is just a system nobody explains.

Where did the old Korean address system come from?

From a tax survey.

Between 1910 and 1918 the Japanese colonial administration conducted a cadastral survey of Korea, mapping and registering every parcel of land in the country. Its purpose was to establish ownership and collect land tax, not to help anyone find an address. The output was the 지번 (jibeon), the lot number, and over the following century it became Korea’s de facto address system by default rather than by design.

That origin explains every frustration that followed. Lot numbers attach to parcels of land, not to positions on a street, and they were issued in the order land was registered. When an owner split or merged a parcel, new numbers were appended. The result had no geographic logic whatsoever: in dense districts, lots numbered in the 250s could sit directly beside lots numbered in the 1500s.

Korea is not alone in this inheritance. Japan uses a structurally similar ward-plus-number system, and from 1962 introduced a separate residential indication system that numbers buildings by block rather than by parcel, which is why Japanese addresses also resist street-based intuition.

Why did it take Korea twenty years to change?

Because the first attempt failed and had to be physically dismantled.

🗓️ The long road to road names

Year	What happened
1995–96	Kim Young-sam government adopts a road name and building number plan
1997	First pilot in Gangnam-gu, Seoul and Anyang
1998	Second pilot in Ansan, Cheongju, Gongju and Gyeongju
1999	Final year of central government funding
2000	Funding withdrawn on the grounds that this is a local matter without sufficient legal basis
2007	Road Name Address Act enacted; dual notation begins
2009	Act comprehensively revised, unified naming principles established
2009–10	Signage installed during the first attempt is removed nationwide and reinstalled
2011	Road-name addresses formally notified, lot numbers shown alongside
2014	Road-name addresses become the sole official standard on 1 January
2015	Five-digit postcodes replace the six-digit system on 1 August

The first round of naming had no governing principles, so districts produced duplicate and near-duplicate names in profusion, and named things that did not need names, including internal apartment complex roads and farm tracks. The 2009 overhaul set actual rules, which meant tearing out and replacing what had already been installed.

Adoption was slow and visibly awkward even after 2014. In December 2013, a month before the switch, private-sector usage was measured at 23.2% against 89% in the public sector. By August 2014, six months in, a government survey of 7,000 adults put overall usage at 59.3%, up from 24.4% at the end of the previous year. Later reporting put uptake at roughly 80% for post and only about 40% for parcel delivery.

How do you take a Korean address apart?

📍 A road-name address, decomposed

Level	Element	Example	What it is
1	Province or metro city	서울특별시 Seoul	Top-level administrative unit
2	District or county	강남구 Gangnam-gu	Second-level unit
3	Road name	테헤란로5길 Teheran-ro 5-gil	Includes the road class suffix
4	Building number	20	Derived from position along the road
5	Detail	3층 3F, or 101동 1502호	Floor, or apartment building and unit
6	Postcode	06132	Five digits, since August 2015

Note what is missing compared with the address you may be used to: there is no street type word like Street or Avenue as a separate token. The road class is baked into the name as a suffix, and that suffix tells you how big the road is.

🛣️ Daero, ro and gil: the three road classes

Suffix	Width	Lanes	Number spacing
대로 daero	40m or more	8 lanes or more, both directions	2 per 20m
로 ro	12m to under 40m	2 to 8 lanes	2 per 20m
길 gil	under 12m	fewer than 2 lanes, alleys	2 per 10m

So “Teheran-ro” is a substantial road, and “Teheran-ro 5-gil” is the fifth alley branching off it. If a Korean friend sends you a gil address, expect a narrow side street, not a boulevard.

Road names are assigned by the mayor or district head following review by an address information committee, and the naming is not purely functional. Alongside ordinary road names there is a parallel category of honorary road names, applied to streets in recognition of people or institutions, which is how streets named after singers and international organisations end up on Korean maps.

Can you tell distance from a building number?

Yes, and this is the single most useful thing to know about the system.

Building numbers are generated from a base number that increments by 2 every 20m along a daero or ro, and every 10m along a gil. Odd numbers run up the left side of the road, even numbers up the right, counted from the road’s starting point.

No other part of a Korean address is this legible. Once you can do this arithmetic in your head, you stop needing to check your phone every thirty seconds.

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Where do lot numbers still rule?

🧾 Territory the old system kept

Domain	Status
Property register (등기부등본)	Lot number remains the identifier of record
Land and forest registers	Lot number required; road-name addresses are not issued
Undeveloped land: fields, forest, landlocked plots	No building means no road-name address at all
Real estate listings	Lot numbers commonly still quoted alongside
Older shops and long-time residents	Still navigate by lot number or by building name

The practical upshot is that a Korean will sometimes give you an address that looks nothing like the one on the building’s plaque, and both will be correct. Korean map apps accept either.

Why does my map app not find the place?

Several reasons, and only one of them is the address system’s fault.

How do you write a Korean apartment address?

Apartment complexes are the case that trips people up most. The whole complex receives one road-name address and one building number. Everything that distinguishes your actual door is detail appended after it: the building within the complex (동, dong), the floor, and the unit (호, ho). Where the building number already identifies the block, the dong is dropped; where the unit number already encodes the floor, the floor is dropped.

A courier who receives only the road-name address of a 2,000-household complex has been given almost no information. Always include the dong and ho.

Korean complexes also increasingly identify themselves by name rather than address. New developments are named by stacking a location, a developer brand and a modifier, which is why complex names keep getting longer, and why an apartment name often does more navigational work in conversation than its official address does.

The five-digit postcode, introduced on 1 August 2015 to replace the six-digit system used since 1988, is based on national base districts rather than postal routes. It is genuinely useful for online checkout forms and almost useless for finding a door.

Related reading

• Why Google Maps does not work properly in Korea
• Why Seoul subway stations have a company name in brackets
• Why Korean parcels sit outside the front door
• Why Korean apartment blocks have brand names
• Seoul neighbourhood guide