Westeros: The North

• The Major Houses - those that stand equivalent with the Starks save for their designation as Wardens of the North - tend to be rare.
• The Houses stand above the majority of their ilk. While they may not have quite the same influence as the Houses Major and Great, they do still bear no small degree of power.
• The Minor Houses are the most common of all the noble houses. Most command a small fortification, a few leagues worth of domain and the smallfolk who work them, and spend their time trying to war with or marry into their neighboring Houses.
• The so-called Masterly Houses are basically houses of landed knights; what sets them apart from other knightly households is the fact that they are in direct service to House Stark, the Wardens of the North. They have the same restrictions as other landed knight households.
• Landed Knight Households are the households of successful or wealthy knights who have been granted land by the House they serve. They are often given a fortification or estate to manage and defend, though they are still within the service of their patron House. Such households are denied "pit and gallows," and may not use the title "Lord" for their heads of household; their heads of household are instead called "Master."

Great House (Status 8)

• House Stark: Great House (Status 8). Lord Eddard Stark, of Winterfell, Warden of the North.

The Wolfswood, the Barrowlands and the Rill

Houses of the Wolfswood & Barrowlands

Major Houses (Status 7)

• House Glover: Ser Galbart Glover, Master of Deepwood Motte.
• House Tallhart: Ser Helman Tallhart, Master of Torrhen's Square.

Houses (Status 6)

• House Cerwyn: Lord Medger Cerwyn, of Castle Cerwyn.
• House Dustin: Lady Barbrey Dustin, Lady of Barrowton.
• House Ryswell: Lord Rodrik Ryswell, Lord of the Rills.

Minor Houses (Status 5)

• House Condon: Lord Arvyn Condon, of Condon Keep. Sworn to House Cerwyn.
• House Ironsmith: Lord Felton Ironsmith, of Ironsmith Hall.
• House Moss: Lady Tarah Moss, of Greensward Tower.
• House Poole: Lord Vayon Poole, of Winterfell.
• House Slate: Lord Cregon Slate, of the Grey Keep.
• House Stout: Lord Harwood Stout, of Barrowton. Sworn to House Dustin.
• House Waterman: Lady Merise Waterman, of the Knifewatch. Sworn to House Manderly.
• House Whitehill: Lord Torvyn Whitehill, of Whitehill. Sworn to House Tallhart.
• House Wisent: Lord Josian Wisent, of Wisenwood.

Masterly Houses (Status 4)

• House Cassel: Ser Rodrik Cassell, Master-of-Arms of Winterfell.

Landed Knight Households (Status 3)

• House Blackhorn: Ser Kromley Blackhorn, of Blackhorn Vale. Sworn to House Wisent.

The Far North

Houses of the Far North

Major Houses (Status 7)

• House Umber: Greatjon Umber, of Last Hearth.

Minor Houses (Status 5)

• House Burley: X
• House Harclay: X
• House Knott: X
• House Lake: X
• House Liddle: X
• House Norrey: X
• House Wull: X

Other

• Night's Watch: A sworn brotherhood of men who take oaths casting aside their former lives - crimes, nobility and name - to defend the Wall from the wildlings that lie beyond it. Their seat is Castle Black, and they maintain two other strongholds: Shadow Tower and Eastwatch-by-the-Sea

The Eastern Coast

Houses of the Eastern Coast

Major Houses (Status 7)

• House Bolton: Roose Bolton, of the Dreadfort
• House Karstark: Rickard Karstark, of Karhold
• House Manderly: Wyman Manderly, of White Harbor

Houses (Status 6)

• House Flint of Widow's Watch: Lyessa Flint, of Widow's Watch.
• House Hornwood: Halys Hornwood, of Hornwood.
• House Locke: Ondrew Locke, of Oldcastle.

Minor Houses (Status 5)

• House Burley: Soren Burley, the Burley of Clan Burley.
• House Lake: X
• House Lightfoot: X
• House Mollen: X
• House Norrey: X
• House Overton: X
• House Wells: X
• House Woolfield: X

Skagos Island

Houses of Skagos Island

Minor Houses (Status 5)

The people of Skagos call themselves Skagosi, which means "Stoneborn" in the Old Tongue, but other northmen call them "Skaggs." Descendents of the First Men, Skagosi are savage, little more than tribes of raiders who are thought to be cannibals.

It's said that in ancient days, men of Skagos sailed to Skane, seizing all the women, killing all the men, and feasting on their hearts and livers for a fortnight. Skane has been uninhabited since.

• House Crowl: Dargyn Crowl, of Deepdown.
• House Magnar: Thuran Magnar, of Kinghouse.
• House Stane: Sumner Stane, of Driftwood Hall.

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Note: Though this is for a canonical setting element in the Song of Ice and Fire, some of the information here is totally created for my game, and should not be taken as an authoritative commentary on that setting element.