What the official sources confirm

The official Tycoon developer blog describes 18 growth levels, starting with hamlets under 100 residents. Passenger journeys and deliveries of required goods award experience. The blog also says that longer trips between towns can award more passenger experience than travel within one town, and that cargo type and production-chain complexity affect growth experience.

Six town ratings influence the experience multiplier. The official overview names transport quality, traffic and environmental conditions among the growth considerations. These are announced mechanics from pre-release material, not results measured in a released build.

Is there a 5,000-person city cap?

No checked official source states a 5,000-person maximum. The 18 announced growth levels do not by themselves establish a final population cap, because no population values for the upper levels were published in the sources reviewed.

The developer says Sandbox mode can change a city’s size and can freeze city growth. That confirms Sandbox controls, but it does not state the numeric limits of those controls.

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Can one city reach one million people?

A reliable answer is not available yet. The official material reviewed does not give a one-million-person target, a step-by-step method, or a verified population limit. Do not treat Transport Fever 2 behavior, community speculation or a search snippet as proof about Transport Fever 3.

Because Steam still showed a scheduled unlock at the observation time, this page has no launch-build test of city population. Recheck after the game is available and record the game version and settings before publishing a numeric result.

Official city-growth video

The official Tycoon Gameplay Overview includes a town-growth chapter. Its English browser-caption transcript was checked with timestamps, and the relevant gameplay segment was visually inspected. The video supports the broad passenger/cargo growth mechanism; it does not answer the population-cap questions.

Transport Fever 3 - Tycoon Gameplay Overview

Official pre-release gameplay video. Its timestamped English browser-caption transcript covers town growth, passenger and cargo experience, and town ratings; a relevant gameplay segment was visually checked. It does not verify population caps or launch-build behavior.

Urban Games · Source / open if playback fails

Sources and verification date

The answer was checked on 29 September 2026 against the official Dev Blog Episode 4, the official First Look Episode 4 and the official Tycoon Gameplay Overview. The written sources are pre-release material. Steam still showed pre-purchase and an approximate eight-hour countdown at 07:19 UTC that day.