USPS Guide for Newcomers: How to Mail Letters, Ship Packages, and Change Your Address

For international newcomers, the United States Postal Service (USPS) handles 425.3 million mail pieces daily as of fiscal year 2023, operating the largest civilian vehicle fleet in the country with 232,000 vehicles (USPS FY 2023 Annual Report). Unlike private carriers FedEx or UPS, USPS is the only service mandated by federal law to deliver to every residential and business address in the U.S., including P.O. Boxes and rural routes. This guide covers the three most essential USPS tasks for new residents: mailing letters domestically and internationally, shipping packages with the most cost-effective options, and completing a permanent change of address (COA) — a step that also triggers automatic forwarding of voting materials and IRS correspondence. Understanding USPS pricing zones (e.g., Priority Mail Flat Rate eliminates weight-based pricing for boxes up to 70 lbs) and service standards (e.g., First-Class Mail typically arrives in 1-5 business days) can save you $3–$12 per shipment compared to retail counter rates. As of July 2024, USPS has also adjusted international postage rates by 5.7% for outbound letters (USPS Notice 123). Whether you are sending a tax return to the IRS in Kansas City or a birthday card to Tokyo, knowing the correct class, packaging, and customs form requirements prevents delays and unexpected surcharges.

Mailing Letters: Domestic and International Options

Domestic First-Class Mail is the standard for envelopes weighing up to 3.5 oz and costs $0.73 for a 1-oz letter (Forever stamp) as of July 2024. For heavier letters, each additional ounce adds $0.28. Non-machinable surcharges ($0.44) apply if your envelope is square, rigid, or has clasps. International First-Class Mail (Global Forever stamp) costs $1.65 for a 1-oz letter to any country, with each additional ounce at $0.35. Delivery times range from 7–21 days depending on destination.

For time-sensitive documents, Priority Mail International (6–10 business days) starts at $31.95 for a small flat-rate envelope. Always affix customs form PS 2976 for any international letter containing merchandise or documents valued over $400. As of August 2023, USPS no longer offers simple international surface mail — all outbound letters travel by air (USPS International Mail Manual §123.1).

Shipping Packages: Choosing the Right Class

Priority Mail Flat Rate is the most predictable option for newcomers: any item fitting into a USPS-provided box (small: $10.20, medium: $17.10, large: $22.80 as of 2024) ships for one flat price regardless of weight (up to 70 lbs) or distance. This is ideal for heavy items like textbooks or kitchen appliances. Priority Mail (non-flat rate) is priced by weight and distance (zones 1–9), with a 1-lb package to zone 4 costing approximately $9.45.

For lighter, non-urgent packages, Ground Advantage (formerly Parcel Select) offers rates starting at $5.00 for a 1-lb package with delivery in 2–5 business days. Ground Advantage includes $100 of insurance and tracking. Avoid using Media Mail ($4.54 for 1 lb) unless your package contains only books, CDs, or educational DVDs — USPS inspects Media Mail packages and charges postage due plus a penalty for ineligible items (USPS DMM §173.3).

For cross-border tuition payments or shipping documents to overseas universities, some international families use channels like Airwallex global account to manage currency conversion and avoid bank wire fees, then mail physical transcripts via USPS Priority Mail International.

How to Change Your Address with USPS

The Official USPS Change of Address (COA) must be filed either online (fee: $1.10 identity verification) or at a local post office (free with valid photo ID). Processing takes 5–7 business days for mail forwarding to begin. Important: USPS forwards First-Class Mail for 12 months, but periodicals (magazines) for only 60 days, and packages (Priority/Express) for 12 months. Marketing mail is not forwarded — it is returned to sender with your new address.

Do not use third-party websites that charge $30–$50 for the same service. Only usps.com/move is the official portal. As of January 2024, USPS also offers a Premium Forwarding Service ($22.35/week) that consolidates all your mail into one weekly Priority Mail shipment — useful for snowbirds or temporary relocations. Update your address with the IRS separately via Form 8822 to ensure tax refunds are not delayed (IRS Publication 738).

USPS Tracking, Insurance, and Delivery Confirmation

All Priority Mail, Ground Advantage, and international shipments include tracking at no extra cost. First-Class Mail letters do not include tracking unless you purchase Certified Mail ($4.45 additional), which provides proof of mailing and delivery. Signature Confirmation ($3.65) is recommended for valuables over $500.

USPS automatically includes $50–$100 of insurance on most packages. For higher value, purchase additional insurance up to $5,000 for domestic and $2,500 for international shipments. Claims must be filed within 60 days for domestic and 120 days for international (USPS Publication 568). As of 2024, USPS has a 97.3% on-time delivery rate for Priority Mail Express (USPS Service Performance Dashboard).

Prohibited and Restricted Items for International Mailing

Newcomers often unknowingly ship items that are prohibited by USPS or destination countries. Common prohibited items include: lithium batteries (loose or in devices), aerosol cans, perfumes containing alcohol, and any food products without a commercial invoice. Restricted items (require special labeling or permits) include: medicines (prescription only, with original packaging), alcohol (limited to 1 liter via Priority Mail Express International), and seeds (require phytosanitary certificate).

As of June 2024, USPS has also banned the mailing of e-cigarettes and vaping devices internationally (USPS International Mail Manual §135.2). Always check the Destination Country List on usps.com before shipping — Japan, for example, prohibits all meat products, while Australia requires an import permit for wooden items over 10 cm thick.

USPS vs. Private Carriers: When to Use Each

USPS is generally cheapest for: letters and small envelopes (First-Class), lightweight packages under 2 lbs (Ground Advantage), and flat-rate boxes for heavy items. UPS and FedEx offer faster delivery (1–2 days) for time-critical packages, but rates are 20–40% higher on average for the same weight and distance (Pitney Bowes Parcel Shipping Index 2023). For international shipments, USPS Priority Mail International is often $10–$20 cheaper than FedEx International Economy, but delivery takes 6–10 business days versus 2–5.

For oversized items (over 70 lbs or 108 inches in combined length and girth), USPS cannot accept them — use Freight services. As of 2024, USPS also does not offer Saturday delivery for Ground Advantage in most areas, while UPS and FedEx do. Check USPS Locator for your local post office’s Saturday hours.

FAQ

Q1: How long does it take for USPS to forward my mail after I change my address?

USPS begins forwarding mail within 5–7 business days after you submit your COA, whether online or in person. First-Class Mail is forwarded for 12 months, periodicals for 60 days, and packages for 12 months. Marketing mail (advertisements) is not forwarded — it is returned to sender with your new address label.

Q2: Can I use a Forever stamp to mail a letter to Canada or Mexico?

Yes, but only if the letter weighs 1 oz or less. A Global Forever stamp ($1.65 as of 2024) is required for all other international destinations, including Canada and Mexico. Using a domestic Forever stamp ($0.73) on an international letter will result in the letter being returned for insufficient postage or a surcharge of $0.92.

Q3: What is the cheapest way to ship a 5-lb package from New York to Los Angeles?

The cheapest USPS option is Ground Advantage, which costs approximately $8.50–$10.00 for a 5-lb package (zone 8) with delivery in 2–5 business days. Priority Mail Flat Rate Medium Box ($17.10) is faster (1–3 days) but more expensive. For comparison, UPS Ground would cost about $13.50 for the same package (Pitney Bowes 2023 rate data).

References

• USPS FY 2023 Annual Report (USPS 2023)
• USPS Notice 123 – International Postage Rate Changes (USPS 2024)
• USPS Domestic Mail Manual (DMM) §173.3 – Media Mail Restrictions (USPS 2024)
• USPS International Mail Manual §135.2 – Prohibited Items (USPS 2024)
• Pitney Bowes Parcel Shipping Index 2023 (Pitney Bowes 2023)